Running from State Route 90, Imperial Highway, in Brea to State Route 71 in Chino Hills, SR 142 is a popular shortcut from the business centers of Brea and surrounding Orange County to the Inland Empire. The road has multiple tight curves, so travel is not recommended for long vehicles, such as big rigs.
Route description
[edit]Backed up traffic on Carbon Canyon roadCarbon Canyon road at the Brea side
SR 142 begins in the city of Brea as Valencia Avenue at a junction with SR 90. The road heads northeast to an intersection with Carbon Canyon Road, which assumes the designation of SR 142 and continues east through Carbon Canyon Regional Park. SR 142 continues into the community of Olinda before crossing into the Sleepy Hollow area of the city of Chino HillsinSan Bernardino County.[2]
SR 142 continues northeast through Chino Hills to an intersection, where it continues eastbound on Chino Hills Parkway. The highway ends at an interchange with SR 71 on the border of Chino Hills and Chino, near the California Institution for Men, a state prison.[3]
In 1933, a road from Brea to Chino was added to the state highway system.[9] It was designated as Route 177 in 1935.[10] In the 1964 state highway renumbering, this became part of SR 142.[11] A routing from Chino to Upland was added to the state highway system as Route 274 in 1959,[12] and was added to SR 142 in the 1964 renumbering from SR 71 to SR 30 (later SR 210),[11][13] but no highway has been built along that route.
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers to an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see California postmile § Official postmile definitions).[1] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
^ abcCalifornia Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original(XLS file) on September 5, 2015. Retrieved June 30, 2015.
^Orange County Road Atlas (Map). Thomas Brothers. 2008.
^San Bernardino County Road Atlas (Map). Thomas Brothers. 2008.
^"Article 2 of Chapter 2 of Division 1". California Streets and Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
^Federal Highway Administration (March 25, 2015). National Highway System: Los Angeles, CA(PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved September 27, 2017.
^Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
^California State Assembly. "An act...relating to State highways". Fifty-first Session of the Legislature. Statutes of California. State of California. Ch. 274.
^It is noted that at the time of renumbering of the California State Highways, Route 142 began at the corner of Imperial Highway and Carolina Avenue (now Kraemer Boulevard), continued north on Carolina Avenue to Birch Street, then east on Birch Street to Valencia Avenue. It turned north on Valencia Avenue and followed the same route as the present. The beginning postmile is R0.75 instead of 0.00 because of the realignment and the resulting shortening of the route.