Description :
This project adds capacity on SR-91 beginning at SR-55 and extending to I-15 in Riverside County. The first priority will be to improve the segment of SR-91 east of SR-241. The goal is to provide up to four new lanes of capacity between SR-241 and Riverside County Line by making best use of available freeway property, adding reversible lanes, building elevated sections and improving connections to SR-241. This project also includes improvements to the segment of SR-91 between SR-241 and SR-55. The concept is to generally add one new lane in each direction and improve the interchanges.
Status:
Three projects are being advanced along SR- 91 to relieve traffic congestion in the corridor connecting Orange County and Riverside County. Caltrans is advancing the final design of a new westbound lane between the Corona Freeway (SR-71) in Riverside County and the Foothill-South (SR-241). This project will extend the existing westbound auxiliary lane that terminates before Green River Road to the SR-71 interchange. Caltrans is also preparing an environmental analysis for adding one new lane each way along SR-91 from SR-55 to SR-241. This project will add significant new capacity through the cities of Anaheim and Placentia. The third project, being advanced by the Riverside County Transportation Commission, is to add a new lane each way between SR-241 in Anaheim to the Corona Freeway (I-15) in Corona. They are currently preparing an environmental analysis for proposed improvements.
Present Day Congestion:
Today, this freeway carries about 314,000 vehicles every day and has about 5,500 daily vehicle hours of delay.
Benefits:
The project will increase freeway capacity and reduce congestion. Traffic volumes are expected to increase by 36 percent, bringing it up to 426,000 vehicles by 2030.
Issues:
Contingent on findings from EIR for new eastbound lane (estimated 2007 completion). Other environmental issues contingent on future Project Study Reports. Improvements east of SR-241 are coordinated with SR-91/SR-241 interchange improvements (non-Measure M funded) and Riverside County’s Measure A widening of SR-91.
Cost (2005 $):
$925.0 million.
External Funding:
CMIA and potential 2006 STIP funding
Risks:
Limited right-of-way in certain sections may require non-standard shoulder and lane widths to minimize right-of-way acquisition.
Related Projects:
EB auxiliary lane, SR-241 to SR-71; Riverside County Measure A 5th lane (SR-241 to I-15)
Involved Agencies:
Caltrans, RCTC, Anaheim, Yorba Linda
References:
Caltrans District 12 Proposed Projects (2004); 2006 Long Range Transportation Plan; 5th lane SR-55 to SR-241 PSR, SR-91 implementation plan

More Information:
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