Editing Interstate 255 (section)

{{Short description|Highway in Illinois and Missouri}}
{{For|the former I-255 in Memphis|Interstate 255 (Tennessee)}}
{{Use mdy dates|date=March 2021}}
{{Use American English|date=March 2022}}
{{Infobox road
|country=USA
|type=I
|route=255
|map={{maplink-road|from=Interstate 255.map}}
|map_custom=yes
|map_notes=I-255 highlighted in red
|maint=[[Illinois Department of Transportation|IDOT]] and [[Missouri Department of Transportation|MoDOT]]
|length_mi=30.82
|length_ref=<ref name="fhwa">{{cite web |first = Jeff |last = Price |date = May 6, 2019 |url = https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table02.cfm |work = Route Log and Finder List |title = Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2018 |publisher = [[Federal Highway Administration]] |access-date = March 23, 2021 }}</ref>
|established=1986
|history=Completed by 1989<ref>{{Illinois road map |year=1989 |access-date=November 24, 2022}}</ref>
|spur_type=I
|spur_of=55
|direction_a=West
|terminus_a={{Jct|state=MO|I|55|I|270}} in [[Mehlville, Missouri|Mehlville, MO]]
|junction={{Plainlist|
*{{Jct|state=MO|US|50|US|61|US|67}} in Mehlville, MO
*{{Jct|state=IL|I|64|US|50}} in [[Washington Park, Illinois|Washington Park, IL]]
*{{Jct|state=IL|I|55|I|70|US|40}} in [[Collinsville, Illinois|Collinsville, IL]]
}}
|direction_b=North
|terminus_b={{Jct|state=IL|I|270|IL|255}} in [[Pontoon Beach, Illinois|Pontoon Beach, IL]]
|counties='''MO''': [[St. Louis County, Missouri|St. Louis]]<br/>'''IL''': [[Monroe County, Illinois|Monroe]], [[St. Clair County, Illinois|St. Clair]], [[Madison County, Illinois|Madison]]
|system1={{infobox road/browselinks/USA|state=MO}}
|system2={{infobox road/browselinks/USA|state=IL}}
|browse={{mo browse|previous_type=MO|previous_route=254|route=MO|next_type=MO|next_route=265}}
{{il browse|previous_type=IL|previous_route=251|route=IL|next_type=IL|next_route=255}}
}}
'''Interstate&nbsp;255''' ('''I-255''') is a [[bypass route]] of [[Interstate 55|I-55]] in [[Greater St. Louis]]. Along with [[Interstate 270 (Illinois-Missouri)|I-270]], it forms a [[loop route|loop]] around the central portion of the bi-state metro area; a majority of I-255 is located on the [[Metro East|Illinois half]]. It shares its southern terminus with I-270 at the junction with I-55; I-270 and I-255 go to the west and east, respectively. [[U.S. Route 50]] (US&nbsp;50) joins I-255 at Lemay Ferry Road. It crosses the [[Mississippi River]] on the [[Jefferson Barracks Bridge]], enters Illinois, and then turns northeast. There is a junction with [[Interstate 64 in Illinois|I-64]], where US&nbsp;50 breaks off and goes east, and then further north there is a junction with I-55 again, [[Interstate 70 in Illinois|I-70]], and [[U.S. Route 40 in Illinois|US&nbsp;40]], all of which are all cosigned together. The next junction is another one with I-270, which is the northern terminus of I-255. After that, the limited-access freeway continues on as [[Illinois Route 255]] (IL&nbsp;255). I-255 is {{convert|30.82|mi|km}} in length.