View source for Ontario Highway 4

{{short description|Ontario provincial highway}}
{{Infobox road
|province       = ON
|type           = Hwy
|route          = 4
|alternate_name = 
|map            = {{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=290|raw={{Wikipedia:Map data/Wikipedia KML/Ontario Highway 4}}}}
|map_custom     = yes
|map_notes      = A map of Highway{{nbsp}}4<br/>{{Legend inline|#FF0000|Highway 4}}{{nbsp}}{{Legend inline|#00007F|[[Connecting Link]]s}}<br />{{Legend inline|#AAAA00|Sections downloaded in 1998}}
|length_km      = 100.8
|length_ref     = <ref name="km" />
|established    = June 24, 1920<ref name="1920-report" />
|direction_a    = South
|terminus_a     = {{jcon|Hwy|3|city=St. Thomas}}
|junction       = {{jcon|Hwy|401|city=London}}<br/>{{jcon|Hwy|402|city=London}}<br/>{{jcon|Hwy|7|town=Elginfield}}
|direction_b    = North
|terminus_b     = {{jcon|Hwy|8|town=Clinton}}<!-- Clinton is under a Connecting Link agreement-->
|cities         = [[St. Thomas, Ontario|St. Thomas]], [[London, Ontario|London]]
|towns          = [[Exeter, Ontario|Exeter]], [[Clinton, Ontario|Clinton]]
|previous_type  = ON
|previous_route = 3
|next_type      = ON
|next_route     = 5
|browse         = {{ON former|previous=3B|next=4A}}
}}
'''King's Highway 4''', also known as '''Highway 4''', is a [[Provincial highways in Ontario|provincially maintained highway]] in the [[Provinces and territories of Canada|Canadian province]] of [[Ontario]]. Originally much longer than its present {{convert|100.8|km|mi|abbr=on}} length, more than half of Highway 4 was transferred to the responsibility of local governments in 1998. It travels between [[Ontario Highway 3|Highway 3]] in [[Talbotville Royal, Ontario|Talbotville Royal]], north-west of [[St. Thomas, Ontario|St. Thomas]], and [[Ontario Highway 8|Highway 8]] in [[Clinton, Ontario|Clinton]], passing through the city of [[London, Ontario|London]] inbetween.

Highway 4 was first designated in 1920, when a {{convert|51|km|adj=on}} route between Talbotville Royal and Elginfield was assumed by the [[Department of Highways, Ontario|Department of Highways]]. It was extended in the early 1930s both south to [[Port Stanley, Ontario|Port Stanley]] as well as north to [[Flesherton, Ontario|Flesherton]].

==Route description==
[[File:Highway4StThomas.JPG|thumb|left|The Highway 4 / Talbot Street junction in [[St. Thomas, Ontario|St. Thomas]]]]

Highway{{nbsp}}4 starts at an intersection with Highway{{nbsp}}3 in Talbotville Royal and continues north as a two-lane undivided highway. For most of its length, the highway bisects agricultural land. It travels along a short {{convert|2.7|km|adj=on}} [[concurrency (road)|concurrency]] with [[Ontario Highway 401|Highway&nbsp;401]] from the community of [[Tempo, Ontario|Tempo]] to Wonderland Road. It encounters an interchange with [[Ontario Highway 402|Highway&nbsp;402]] before entering [[London, Ontario|London]] city limits. As Highway{{nbsp}}4 enters London, it becomes a [[Connecting Link]], known locally as Wonderland Road. Wonderland Road is a 4-lane arterial thoroughfare serving western London, with several big-box stores, a mall, and residential areas. The route turns east onto Sunningdale Road West, which it for a short distance before turning north along Richmond Street.<ref name="2016aadtpdf">{{cite web
 | title       = Annual Average Daily Traffic (AADT) counts
 | author      = Ministry of Transportation of Ontario
 | author-link = Ministry of Transportation of Ontario
 | year        = 2016
 | url         = https://www.library.mto.gov.on.ca/SydneyPLUS/TechPubs/Portal/tp/tvSplash.aspx
 | access-date = January 1, 2021}}</ref><ref name="gmaps">{{Google maps
 | title       = Highway 4 – Length and Route
 | url         = https://www.google.ca/maps/dir/42.8030503,-81.2525156/43.6171487,-81.5397695/@43.2040271,-81.8897676,141362m/data=!3m1!1e3!4m19!4m18!1m15!3m4!1m2!1d-81.2695598!2d42.8604388!3s0x882ef66c3792413d:0x64671f33e1c3ada0!3m4!1m2!1d-81.2737262!2d42.9103043!3s0x882ef6b8031978f9:0x56b6423be27782fc!3m4!1m2!1d-81.3013306!2d43.0346654!3s0x882eefa96da363f1:0xbf036102b07d0eb6!1m0!3e0
 | access-date = October 12, 2021}}</ref><ref name="2022 mapart">{{cite map
| title       = Ontario Back Road Atlas
| cartography = [[MapArt]]
| publisher   = Mapart Publishing
| year        = 2022
| isbn        = 1-55198-226-9
| pages       = 13–14, 20}}</ref>

Highway{{nbsp}}4 continues north, passing through [[Arva, Ontario|Arva]], when the surrounding terrain returns to farmland. Highway{{nbsp}}4 passes through [[Birr, Ontario|Birr]] before intersecting with the western terminus of [[Ontario Highway 7|Highway&nbsp;7]] at [[Elginfield, Ontario|Elginfield]], which is also 1&nbsp;km east of the [[Ontario Highway 23|Highway&nbsp;23]] junction with Highway{{nbsp}}7. The highway then curves slightly west, passing through [[Lucan, Ontario|Lucan]] before continuing north at Clandeboye. From here to its terminus in Clinton, Highway{{nbsp}}4 is essentially straight for {{convert|45|km}}. Continuing to be flanked by farmland, it then passes through the communities of [[Huron Park, Ontario|Huron Park]] and [[Exeter, Ontario|Exeter]]. At Exeter, it crosses the former route of [[Ontario Highway 83|Highway&nbsp;83]]. From there, it continues north, passing through the communities of [[Hensall, Ontario]] and [[Vanastra, Ontario]] before terminating at Highway{{nbsp}}8 in the community of Clinton.<ref name="2016aadtpdf" /><ref name="gmaps" /><ref name="2022 mapart" />
{{clear|left}}

==History==
[[File:Highway 4 north of St. Thomas, June 23, 1948.png|thumb|left|Highway 4 north of St. Thomas in 1948]]

Highway{{nbsp}}4 was originally designated in 1920 when the provincial government assumed the road running from Talbotville Royal (St. Thomas) to the Northern Highway (later Highway{{nbsp}}7) at Elginfield, via London. The portions within Elgin County were assumed on August{{nbsp}}4, while the portions south of London were assumed on June{{nbsp}}24. The portions north of and through London were assumed on August{{nbsp}}6.<ref name="1920-report">{{cite report
 | title       = Annual Report
 | edition     = 1920
 | publisher   = Department of Highways
 | date        = April 26, 1921
 | section     = Report on Provincial Highways
 | pages       = 40, 43
 | url         = https://archive.org/details/n04ontariosession53ontauoft/page/n155/mode/2up
 | access-date = October 12, 2021
 | via         = Internet Archive}}</ref>
The {{convert|51.2|km|adj=on}} route featured a concurrency with the Provincial Highway (later Highway{{nbsp}}2) between Lambeth and downtown London.<ref>{{cite map
 | title       = Ontario Road Map
 | publisher   = Ontario Department of Public Highways
 | year        = 1923
 | scale       = 24 mi : 1 in
 | url         = http://ao.minisisinc.com/FS_IMAGES/I0050469.jpg
 | access-date = October 12, 2021
 | via         = Archives of Ontario}}</ref><ref>{{cite map
 | title       = Ontario Road Map
 | publisher   = Ontario Department of Public Highways
 | year        = 1925
 | scale       = 16 mi : 1 in
 | inset       = Mileage Tables
 | url         = http://ao.minisisinc.com/FS_IMAGES/I0050470.jpg
 | access-date = October 12, 2021
 | via         = Archives of Ontario}}</ref>

Until the summer of 1925, Ontario highways were named rather than numbered. When route numbering was introduced, the route between St. Thomas and Elginfield became Provincial Highway{{nbsp}}4.<ref>{{cite journal
 | title      = Provincial Highways Now Being Numbered
 | publisher  = Monetary Times Print
 | journal       = The Canadian Engineer
 | date       = August 25, 1925
 | volume     = 49
 | issue      = 8
 | page       = 246
 | quote      = Numbering of the various provincial highways in Ontario has been commenced by the Department of Public Highways. Resident engineers are now receiving metal numbers to be placed on poles along the provincial highways. These numbers will also be placed on poles throughout cities, towns and villages, and motorists should then have no trouble in finding their way in and out of urban municipalities. Road designations from "2" to "17" have already been allotted...}}</ref>
1927 saw several new sections of road assumed that would become portion of Highway{{nbsp}}4. On September{{nbsp}}14, the route was extended to [[Ontario Highway 8|Highway&nbsp;8]] at Clinton. Further north, a new highway was created on June{{nbsp}}22, 1927, between [[Ontario Highway 9|Highway&nbsp;9]] at [[Walkerton, Ontario|Walkerton]] and [[Ontario Highway 6|Highway&nbsp;6]] at [[Durham, Ontario|Durham]]. This latter section was designated as Highway{{nbsp}}4A.<ref name="1927-report">{{cite report
 | title       = Annual Report
 | edition     = 1927
 | publisher   = Department of Highways
 | date        = March 1, 1929
 | page = 
 | section     = Appendix No. 6 – Schedule of Assumptions and Reversions of the Provincial Highway System
 | pages        = 59–60
 | url         = https://archive.org/details/n05ontariosession61ontauoft/page/n987/mode/2up
 | access-date = October 12, 2021
 | via         = Internet Archive}}</ref>

On March{{nbsp}}12, 1930, Highway{{nbsp}}4 was extended to Durham, fully absorbing the route of Highway{{nbsp}}4A in the process. Two months later, on May{{nbsp}}11, it was extended south to Bedford Street (now Edith Cavell Boulevard) in Port Stanley.<ref name="30extensions">{{cite report
 | title       = Annual Report
 | edition     = 1930 and 1931
 | publisher   = Department of Highways
 | date        = October 24, 1932
 | section     = Appendix No. 5 – Schedule of Assumptions and Reversions
 | page        = 76
 | url         = https://archive.org/details/n06ontariosession64ontauoft/page/75/mode/2up
 | access-date = October 12, 2021
 | via         = Internet Archive}}</ref> On April{{nbsp}}11, 1934, the highway was extended east to the intersection of [[Ontario Highway 10|Highway&nbsp;10]] in Flesherton.<ref name="31extensions">{{cite report
 | title       = Annual Report
 | edition     = 1934
 | publisher   = Department of Highways
 | date        = March 18, 1935
 | section     = Appendix No. 4 – Schedule of Assumptions and Reversions
 | page        = 119
 | url         = https://archive.org/details/n06ontariosession67ontauoft/page/118/mode/2up
 | access-date = October 12, 2021
 | via         = Internet Archive}}</ref> Highway{{nbsp}}4 reached its maximum length of {{convert|275.6|km}} when it was extended from Flesherton to [[Ontario Highway 24|Highway&nbsp;24]] in Singhampton in the mid-1970s.<ref>{{cite map
 | title       = Ontario Road Map
 | cartography = Cartography Section
 | publisher   = Ministry of Transportation and Communications
 | year        = 1974
 | section     = J21
 | url         = http://ao.minisisinc.com/FS_IMAGES/I0050573.jpg
 | access-date = October 27, 2021
 | via         = Archives of Ontario}}</ref><ref>{{cite map
 | title       = Ontario Road Map
 | cartography = Cartography Section
 | publisher   = Ministry of Transportation and Communications
 | year        = 1977
 | sections    = G21–22
 | url         = http://ao.minisisinc.com/FS_IMAGES/I0050574.jpg
 | access-date = October 23, 2021
 | via         = Archives of Ontario}}</ref><ref name="km-1997">{{cite journal

 | title       = Provincial Highways Distance Table
 | author      = Transportation Capital Branch
 | journal     = Provincial Highways Distance Table: King's Secondary Highways and Tertiary Roads
 | publisher   = Ministry of Transportation of Ontario
 | year        = 1997
 | issn        = 0825-5350
 | pages       = 12–14
 | url         = https://collections.ola.org/ser/5129/1997.pdf
 | access-date = October 13, 2021
 | via         = Legislative Assembly of Ontario}}</ref>

=== Downloads ===
[[File:Highway4Lambeth.JPG|thumb|right|Former alignment of Highway 4 looking north towards [[Lambeth, Middlesex County, Ontario|Lambeth]] from the [[Ontario Highway 402|Highway 402]] interchange in [[London, Ontario|London]]]]

As part of a series of budget cuts initiated by premier [[Mike Harris]] under his [[Common Sense Revolution]] platform in 1995, numerous highways deemed to no longer be of significance to the provincial network were decommissioned and responsibility for the routes transferred to a lower level of government, a process referred to as downloading. Portions of Highway{{nbsp}}4 were transferred to the counties of [[Elgin County|Elgin]], [[Huron County, Ontario|Huron]], [[Bruce County|Bruce]] and [[Grey County|Grey]] on January{{nbsp}}1, 1998.<ref name="WDW">{{cite report

 | title     = Highway Transfers List – "Who Does What"
 | publisher = Ministry of Transportation of Ontario
 | date      = June 20, 2001
 | pages     = 5–7}}</ref>

The former portion of Highway 4 south of St. Thomas is now signed as [[List of numbered roads in Elgin County|Elgin County Road&nbsp;4]]. The former northern portion is broken into several different roads:
* [[List of numbered roads in Huron County|Huron County Road&nbsp;4]] from [[Clinton, Ontario|Clinton]] to near [[Wingham, Ontario|Wingham]]
* [[List of numbered roads in Bruce County|Bruce County Road&nbsp;4]] (London Road) from near Wingham to Riversdale
* A former [[Concurrency (road)|concurrency]] with Highway{{nbsp}}9 between Riversdale and Walkerton
* [[List of numbered roads in Grey County|Grey County Road&nbsp;4]] from Walkerton to [[List of numbered roads in Simcoe County|Simcoe County Road&nbsp;124]] just south of Singhampton

In 2017, the [[London, Ontario|City of London]] announced that Highway 4 through London would be re-signed and re-routed via Richmond Street, Sunningdale Road, and Wonderland Road, resulting in a short [[concurrency (roads)|concurrency]] with Highway 401 between the Colonel Talbot Road and Wonderland Road interchanges.<ref name=reroute>{{cite web
 | title        = Highway 4 Re-Route
 | website      = City of London
 | url          = http://www.london.ca/residents/Roads-Transportation/traffic-management/Pages/Highway-4-Reroute.aspx
 | access-date  = October 13, 2021
 | archive-url  = https://web.archive.org/web/20171106095316/http://www.london.ca/residents/Roads-Transportation/traffic-management/Pages/Highway-4-Reroute.aspx
 | archive-date = November 6, 2017
 | url-status   = dead}}</ref>
{{clear}}

==Major intersections==
{{ONinttop|maint=MTO|length_ref=<ref name="km">{{cite web
|title = Annual Average Daily Traffic (AADT) counts
|author = Ministry of Transportation of Ontario
|author-link = Ministry of Transportation of Ontario
|year = 2008
|url = http://www.raqsb.mto.gov.on.ca/techpubs/TrafficVolumes.nsf/tvweb?OpenForm&Seq=5
|access-date = February 13, 2012
|archive-url = https://web.archive.org/web/20110706192209/http://www.raqsb.mto.gov.on.ca/techpubs/TrafficVolumes.nsf/tvweb?OpenForm&Seq=5
|archive-date = July 6, 2011
|url-status = dead
}}</ref>}}
{{ONint|former
| division         = Elgin
| dspan            = 2
| location         = Central Elgin
| lspan            = 2
| km               = -19.2
| road             = [[Edith Cavell]] Boulevard
| notes            = [[Port Stanley, Ontario|Port Stanley]]; former Highway&nbsp;4 southern terminus
}}
{{ONint|former
| km               = -17.3
| road             = {{jcon|Elgin|4|dir=begins|fulltext=y}}<hr/>{{jcon|Elgin|21|dir=west|Warren Street}}
| notes            = 
}}
{{ONint|former
| municipality_special = [[St. Thomas, Ontario|St. Thomas]]
| km               = -7.5
| km2              = -2.2
| bridge           = {{cvt|5.3|km|mi}} gap in {{jcon|Elgin|4|ot=y}}
}}
{{ONint
| division         = Elgin
| dspan            = 2
| location         = Southwold
| lspan            = 2
| type             = trans
| km               = 0.0
| road             = {{jcon|Elgin|4|dir=ends|fulltext=y}}<br/>{{jcon|Hwy|4|dir=begins|nolink=y|shield=y}}<hr/>{{jcon|Hwy|3|dir=east|city=St. Thomas|city2=Aylmer}}<br/>{{jcon|Elgin|3|dir=west|Talbot Line}}
| notes            = [[Talbotville Royal]]; Highway&nbsp;4 southern terminus
}}
{{ONint
| km               = 2.1
| road             = {{jcon|Elgin|11|dir=east|Clinton Line}}
| notes            = 
}}
{{ONint
| division_special = [[Elgin County|Elgin]]&ndash;[[London, Ontario|London]] boundary
| location_special = [[Southwold, Ontario|Southwold]]&ndash;[[London, Ontario|London]] boundary
| km               = 3.5
| road             = {{jcon|Elgin|18|dir=west|Southminster Borne}}
| notes            = 
}}
{{ONint
| municipality     = London
| lspan            = 7
| type             = concur
| location         = &nbsp;
| km               = 6.0
| road             = {{jcon|Hwy|401|dir=west|city=Windsor}}<hr/>Colonel Talbot Road
| notes            = Beginning of Highway&nbsp;401 concurrency; Highway&nbsp;401 exit&nbsp;177
}}
{{ONint
| type             = concur
| km               = 8.8
| road             = {{jcon|Hwy|401|dir=east|city=Toronto}}<hr/>Wonderland Road
| notes            = End of Highway&nbsp;401 concurrency; Highway&nbsp;401 exit&nbsp;180
}}
{{ONint
| km               = 15.9
| road             = {{jcon|Hwy|402|to=401|dir=east|city=Sarnia}}
| notes            = Highway&nbsp;402 exit&nbsp;100
}}
{{ONint
| km               = 18.1
| road             = Exeter Road
| notes            = Formerly [[Ontario Highway 135|Highway&nbsp;135]]
}}
{{ONint
| km               = 18.4
| road             = Wharncliffe Road&nbsp;S
| notes            = Former routing of Highway 4 (before Jan. 2018) and [[Ontario Highway 2|Highway 2]] along Wharncliffe Rd
}}
{{ONint
| km               = 29.8
| road             = Fanshawe Park Road&nbsp;W
| notes            = Formerly [[Ontario Highway 22|Highway&nbsp;22]] west
}}
{{ONint
| km               = 34.0
| road             = Richmond St&nbsp;/ Sunningdale Rd
| notes            = Former routing of Highway 4 via Richmond Street south
}}
{{ONint
| division         = Middlesex
| dspan            = 7
| location         = Middlesex Centre
| lspan            = 2
| km               = 31.6
| road             = {{jcon|Middlesex|28|Medway Road}}
| notes            = [[Arva, Ontario|Arva]]
}}
{{ONint
| km               = 37.2
| road             = {{jcon|Middlesex|16|Ilderton Road}}
| notes            = 
}}
{{ONint
| location_special = [[Middlesex Centre]]&ndash;[[Lucan Biddulph]] boundary
| km               = 45.4
| road             = {{jcon|Hwy|7|to=23|dir=east|todir=north|city=Stratford|town2=Mitchell}}<br/>{{jcon|Middlesex|7|dir=west|Elginfield Road|town=Ailsa Craig|town2=Parkhill}}
| notes            = [[Elginfield, Ontario|Elginfield]]
}}
{{ONint
| location         = Lucan Biddulph
| lspan            = 2
| km               = 49.4
| road             = {{jcon|Middlesex|47|Saintsbury Line}}
| notes            = [[Lucan, Ontario|Lucan]]
| nspan            = 2
}}
{{ONint
| km               = 50.1
| road             = {{jcon|Middlesex|13|William Street, Alice Street}}
| notes            = none
}}
{{ONint
| location_special = [[North Middlesex, Ontario|North Middlesex]]&ndash;[[Lucan Biddulph]] boundary
| lspan            = 2
| km               = 54.3
| road             = {{jcon|Middlesex|20|dir=south|Denfield Road}}
| notes            = [[Clandeboye, Ontario|Clandeboye]]
}}
{{ONint
| km               = 56.1
| road             = {{jcon|Middlesex|24|dir=west|McGillivray Road}}
| notes            = 
}}
{{ONint
| division_special = [[Middlesex County, Ontario|Middlesex]]&ndash;[[Huron County, Ontario|Huron]] boundary
| location_special = [[North Middlesex, Ontario|North Middlesex]]&ndash;[[Lucan Biddulph]]–[[South Huron]] boundary
| km               = 62.2
| road             = {{jcon|Middlesex|5|dir=west|Mount Carmel Road}}
| notes            = [[Centralia, Ontario|Centralia]]
}}
{{ONint
| division         = Huron
| dspan            = 9
| location         = South Huron
| lspan            = 3
| km               = 66.3
| road             = {{jcon|Huron|10|dir=west|Crediton Road}}
| notes            = 
}}
{{ONint
| km               = 68.4
| road             = {{jcon|Huron|6|dir=east|Kirkton Road}}
| notes            = 
}}
{{ONint
| km               = 72.4
| road             = {{jcon|Huron|83|Thames Road}}
| notes            = [[Exeter, Ontario|Exeter]]; formerly [[Ontario Highway 83|Highway&nbsp;83]]
}}
{{ONint
| location         = Bluewater
| km               = 80.3
| road             = {{jcon|Huron|84|King Street}}
| notes            = [[Hensall, Ontario|Hensall]]; formerly [[Ontario Highway 84|Highway&nbsp;84]]
}}
{{ONint
| location_special = [[Bluewater, Ontario|Bluewater]]&ndash;[[Huron East, Ontario|Huron East]] boundary
| lspan            = 2
| km               = 84.3
| road             = {{jcon|Huron|12|Kippen Road}}
| notes            = [[Kippen, Ontario|Kippen]]
}}
{{ONint
| km               = 90.4
| road             = {{jcon|Huron|3|Mill Road}}
| notes            = [[Brucefield, Ontario|Brucefield]]
}}
{{ONint
| location_special = [[Central Huron]]<br/>([[Clinton, Ontario|Clinton]])
| lspan            = 2
| km               = 100.7
| road             = {{jcon|Huron|13|dir=east|King Street}}
| notes            = 
}}
{{ONint
| type             = trans
| km               = 100.8
| road             = {{jcon|Hwy|8|town=Goderich|city2=Stratford}}<hr/>{{jcon|Hwy|4|dir=ends|nolink=y|shield=y}}<br/>{{jcon|Huron|4|dir=begins|fulltext=y}}
| notes            = Highway&nbsp;4 northern terminus; continues as {{jcon|Huron|4|ot=y}}
}}
{{ONint|former
| location_special = [[North Huron, Ontario|North Huron]]&ndash;[[Morris-Turnberry]] boundary
| km               = 135.8
| road             = {{jcon|Huron|86|Amberley Road}}
| notes            = [[Wingham, Ontario|Wingham]]; formerly [[Ontario Highway 86|Highway&nbsp;86]]
}}
{{ONint|former
| division_special = [[Huron County, Ontario|Huron]]&ndash;[[Bruce County, Ontario|Bruce]] boundary
| location_special = [[Morris-Turnberry]]&ndash;[[South Bruce, Ontario|South Bruce]] boundary
| km               = 143.4
| km2              = 144.9
| road             = {{jcon|Huron|4|dir=ends|fulltext=y}}<br/>{{jcon|Bruce|4|dir=begins|fulltext=y}}
| notes            = {{cvt|1.5|km|mi|1}} {{jcon|Huron|4|con=4|contype=Bruce|ot=y|fulltext=y}} concurrency
}}
{{ONint|former
| division         = Bruce
| dspan            = 2
| location         = Brockton
| lspan            = 2
| km               = 161.8
| road             = {{jcon|Hwy|9|dir=west|town=Harriston}}<hr/>{{jcon|Bruce|20|dir=north}}
| notes            = Former southern end of Highway&nbsp;9 concurrency
}}
{{ONint|former
| km               = 175.3
| road             = {{jcon|Hwy|9|dir=east|town=Kincardine}}
| notes            = [[Walkerton, Ontario|Walkerton]]; former northern end of Highway&nbsp;9 concurrency
}}
{{ONint|former
| division_special = [[Bruce County, Ontario|Bruce]]&ndash;[[Grey County|Grey]] boundary
| location_special = [[Brockton, Ontario|Brockton]]&ndash;[[Hanover, Ontario|Hanover]] boundary
| km               = 186.7
| road             = {{jcon|Bruce|4|dir=ends|fulltext=y}}<br/>{{jcon|Grey|4|dir=begins|fulltext=y}}
| notes            = 
}}
{{ONint|former
| division         = Grey
| dspan            = 3
| location         = Hanover
| km               = 187.4
| road             = {{jcon|Grey|10|7th&nbsp;Avenue}}
| notes            = 
}}
{{ONint|former
| location         = West Grey
| km               = 205.8
| road             = {{jcon|Hwy|6|city=Owen Sound|town2=Mount Forest}}
| notes            = [[Durham, Ontario|Durham]]
}}
{{ONint|former
| location         = Grey Highlands
| km               = 230.7
| road             = {{jcon|Hwy|10|city=Owen Sound|town2=Shelburne}}
| notes            = [[Flesherton, Ontario|Flesherton]]
}}
{{ONint|former
| division_special = [[Grey County|Grey]]&ndash;[[Simcoe County, Ontario|Simcoe]] boundary
| location_special = [[Grey Highlands]]&ndash;[[Clearview, Ontario|Clearview]] boundary
| km               = 256.7
| road             = {{jcon|Grey|124|contype=Simcoe|con=124|fulltext=y}}
| notes            = [[Singhampton, Ontario|Singhampton]]; formerly [[Ontario Highway 24|Highway&nbsp;24]]; former Highway&nbsp;4 northern terminus
}}
{{jctbtm|keys=concur,closed,trans}}

==References==
{{Attached KML|display="title, inline"}}
{{Commons category}}
{{Reflist}}

{{Ontario King's Highways}}
{{Roads in London, Ontario}}

[[Category:Ontario provincial highways|004]]
[[Category:Roads in London, Ontario]]
[[Category:Transport in St. Thomas, Ontario]]