Map of the Month

Each month a new map is presented to the Commission to help explain important trends in the Bay Area, across the nation and around the world. These custom-crafted maps are prepared by MTC’s GIS and modeling team.

September 2018

Possible 2027 Effects of the Passage of California Proposition 6 on Future Bay Area Pavement Condition

This month's map in illustrates the impact on local pavement condition that could result from the passage or failure of Proposition 6, a statewide measure that has been submitted to California voters for consideration on November 6th, 2018. This trio of maps focuses on Pavement Condition Index (PCI), a metric used in determining the structural quality of existing roadway surfaces. The index ranges from 0 to 100, with 0 representing a failed road and 100 representing a brand-new facility. Currently in the nine-county Bay Area region, the 109 jurisdictions (including unincorporated parts of the counties) have an average PCI score of 67, which corresponds to a "Fair" condition. Should Proposition 6 pass, the Bay Area�s average PCI score would fall to 57, which is "At risk" of failure. If Proposition 6 fails, SB 1 funds will remain intact thus providing dedicated funding to address significant deferred maintenance in the region's local road network and hold the average PCI score steady at 66 in 2027. Individual jurisdictions may notice a decline in their average PCI score even if Proposition 6 fails. This is because even with the SB 1 funding, a jurisdiction's average PCI score may still worsen over the next decade due to decades of underfunding. However, localities would see a far more precipitous decline in their PCI score -- with far costlier repair implications -- should Proposition 6 pass.