Main Street Corridor Study
City of Manteca

When the City of Manteca contracted with TJKM for this study, the primary objective was to reduce traffic congestion on the Main Street corridor in downtown Manteca. The combination of high traffic volumes, limited street capacity and close spacing of traffic signals resulted in major traffic issues. Congestion, delays, motorist confusion and potential safety hazards all existed in this section of the Main Street corridor. To improve traffic in the area, TJKM created and evaluated five traffic improvement program alternatives, including revised street geometry and signal operations. Over the past five years, Manteca has worked to provide a more pedestrian-scale dimension to their downtown that is also used as an important commute corridor to and from two freeways, Highway 99 and Highway 120.

The initial plan called for just one through lane in each direction and the addition of a center median and a two-way left turn lane. The new plan returned the previously prohibited left turns at the primary intersection of Main and Yosemite - to the applause of local merchants and community groups. However, better signal operations were required to accommodate these changes. TJKM’s signal coordination plans originally implemented in 2002 and subsequently updated for current traffic conditions in November 2005 resulted in significantly reduced delays and congestion over fourteen hours daily and ten hours each on Saturday and Sunday.

For further information on traffic improvements for heavily traveled corridors, contact Rich Haygood at rhaygood@tjkm.com.