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From Route 90 near Brea to Route 71 near Chino.
This segment was originally LRN 177, defined in 1933. It was not signed before 1964. It originally split off or Route 90 [LRN 176] at Carolina (now Kraemer), then Birch/Brea/Olinda Blvd to Valencia Ave, and then up to Carbon Canyon Rd.Sometime after 1959, it was routed directly up Valencia to Carbon Canyon Road from Imperial Highway.
In August 2011, the CTC approved $3,025,000 in SHOPP funding for repairs in and near Brea, from Brea Hills Ave to the San Bernardino County Line (~ ORA 2.515 to ORA 6.346), that will rehabilitate 7.6 lane miles of pavement to improve safety and ride quality.
Carbon Canyon Truck Restrictions (~ORA R1.801 to SBD R3.792)
In May 2017, it was reported that Caltrans is exploring
a plan to restrict truck traffic on this route. The first step to restrict
big rigs on Carbon Canyon Road (~ORA R1.801 to SBD R3.792) took place in
early May when a preliminary study on the state highway was unveiled to
approximately 50 residents at the Chino Hills public works commission
meeting. Transportation engineering consultant Clyde Prem said trucks are
scraping the roadside and causing ten-to-twenty minute traffic delays
navigating the switchbacks and steep grades. He said a process exists
where Caltrans can restrict truck traffic but it is rarely undertaken. It
includes sending resolutions to two Caltrans districts because the
8.4-mile road, known as Route 142, is located in Brea and Chino Hills.
Traffic, legal, and environmental offices in Sacramento would become
involved in the effort. The study was commissioned last November after
concerns mounted about the volume of traffic on Carbon Canyon Road and the
increased amount of large trucks using the road as a bypass route. Traffic
congestion is also caused by the terrain, school bus stops, uphill grades,
a narrow bridge, and the signals at Olinda Place and Ruby Street on the
Brea side, according to the study. The report revealed 92 collisions
resulted in 153 injuries and three fatalities between 2010 and 2015. Of
the injuries, 52 were in Chino Hills and 101 in Brea. Unsafe speed and
improper turning were the two leading causes of collisions. Residents said
trucks cross the yellow lines on the switchbacks endangering oncoming
traffic. Caltrans has determined that widening is not possible because of
the terrain and development alongside the road. The commission voted to
support the second phase of the study that would address truck traffic,
safety, and traffic flow along Carbon Canyon Road.
(Source: Champion Newspapers, 5/6/2017)
In June 2019, it was reported that Chino Hills and Brea
have each adopted resolutions requesting Caltrans to ban large truck
traffic from using Carbon Canyon Road. The cities submitted the
resolutions to Caltrans June 19. The city has been working for the last
few years with Caltrans, the Chino Hills and Brea police departments, the
City of Brea, and the California Highway Patrol to study the problem. It
was agreed that a traffic study was needed to identify key issues and
propose solutions with an emphasis on banning large-truck traffic.
Residents have been expressing concern that excessively large trucks
cannot maneuver through the tight curves along Carbon Canyon Road and
encroach onto oncoming traffic as they make the turns. Chino Hills and
Brea shared costs for the traffic study.
(Source: Champion Newspapers, 6/29/2019)
From Route 71 near Chino to Route 210 near Upland.
This segment is proposed LRN 274, defined in 1959. Its routing has not been determined, and it does not appear to correspond to a surface street route.
Central Avenue and a grid of local streets could be used but the roads do not adequately fit the definition of a traversable highway. A route is in the very preliminary planning stages.
"Carbon Canyon Freeway". Named by location.
Signed Route 142 was not defined as part of the initial state signage of routes in 1934. It is unclear what (if any) route was signed as Route 142 between 1934 and 1964.
[SHC 263.7] From the Orange-San Bernardino county line to Peyton Drive.
Overall statistics for Route 142:
In 1933, Chapter 767 defined the route from "[LRN 4] near Bakersfield to [LRN 57] near Isabella via Glennville" as part of the state highway system. In 1935, this route was added to the code as LRN 142 with that definition. In 1963, Chapter 1698 would have changed LRN 4 to LRN 141, but that change didn't occur due to the passage of the "great renumbering" (Chapter 385).
This route originally was the Bakersfield-Glennville Road into Glennville and thence to Isabella via Woody. All of this was originally part of Route 155. However, in 1965, the Bakersfield to Glennville Road portion was deleted from the state highway system and Route 155 was rerouted onto former LRN 136 (part of former Route 211).
Acronyms and Explanations:
Route 141 Route 143
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