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City plan addresses street, traffic needs
Manteca plans to spend $500,000 for new pavement on Spreckels Avenue during the upcoming fiscal year starting July 1. - photo by DENNIS WYATT
Work is expected to begin during  the upcoming fiscal year that starts July 1  on the $21.2 million endeavor to convert the Union Road and 120 Bypass interchange into California’s first diverging diamond interchange.
It is one of a number of road endeavors outlined in the proposed capital improvement program for Manteca street as part of the 2018-2019 proposed municipal budget the City Council will consider for adoption on June 19.
The diverging diamond design has been used successfully elsewhere in the country to significantly improve traffic flows by reducing the need for traffic signals, enhancing safety and reducing construction costs, The nearest diverging diamond is in Reno on Interstate 580 at Mona Lane.
The diverging diamond design calls for traffic lanes crossing  on either side of the bridge structure so northbound traffic would cross the bridge on the west side instead of the east side with the southbound lanes on the east side instead of the west side. Once they clear the bridge they are switched back.
The on and off ramps along with the flipping of the lanes creates two semi-diamond shaped intersections on either side of the bridge. This eliminates the need for traffic from both directions on Union Road as well as that coming from the 120 Bypass avoid needing any  traffic signals to exit an off ramp or to get into an on ramp. The project will also include ramp meter signals such as now are in place on the Lathrop Road/Highway interchange.
The other major undertaking is the construction of a new interchange at McKinley Avenue and the 120 Bypass. Work is targeted to start in 2019. The city has $21.2 million set aside from previous budget years and is looking for another $20 million for the 2019-2020 budget year to pay for the $41.2 million project.
The capital improvement project delineates street projects that will take place in the coming 12 months as well as in future years within a five-year horizon.
Add a continuous turn lane on Airport Way between Yosemite Avenue and Daniels Street to increase safety and traffic volume. The city has set $2.46 million toward the project in a previous budget.
The improvement of Yosemite Avenue from Cottage Street to Main Street at a cost of $2.8 million. Work is targeted to start in September.
Extending Milo Candini Drive from where it ends at the edge of the Big League Dreams sports complex to Yosemite Avenue. There is $1,225,000 set aside for the work.
New, state-of-the-art reflective street signs to replace older signs that are in place to improve traffic safety. A $2.7 million federal grant has been secured for the work.
Replacement of the in-ground crosswalk flashers on Woodward Avenue at Wellington Avenue with overhead flashers at a cost of $500,000.
The improvement of Main Street from Atherton Drive to Yosemite Avenue at a cost of $2 million. Work is targeted to start in September.
Spending $250,000 to inspect and develop a plan for Manteca’s 418 miles of sidewalk.
Modernization traffic signal controls with state-of-the-art technology to improve traffic movements. The city has already secured a $3.2 million grant for the work.
Converting Main Street from Yosemite Avenue from two lanes to four lanes at a cost of $1.3 million.
Improving Springtime Estates neighborhood streets for $1.2 million using pavers on main streets and around the park and asphalt on other streets.
A traffic signal for Union Road and Woodward Avenue plus other intersection improvements for $1.2 million.
Conducting a traffic study of the Lathrop Road corridor at a cost of $150,000.
A citywide truck route study at a cost of $125,000.
Pavement repair in the Mayors’ Park neighborhood at a cost of $1.2 million.
Upgrading and installing traffic signals at Woodward Avenue and Main Street at a cost of $3.4 million.
Installing new pavement surface on Spreckels Avenue in the upcoming fiscal year at a cost of $500,000.

To contact Dennis Wyatt, email