Impacts on traffic on Johnson Drive will be “significant and unavoidable”

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The City of Pleasanton Planning Commission staff has created a draft Environmental Impact Report regarding the proposed rezoning and development of the Johnson Drive Economic Development Zone (JDEDZ) project. If you like reading huge, technical reports, you can see the entire document here.

Basically in the report summary, the staff says:

“The analysis in this SEIR indicates that development facilitated by the EDZ would generate air emissions that would result in a net increase of criteria pollutants which would conflict with implementation of the applicable air quality plan, and increased traffic which would affect levels of service for freeway ramps at merge/diverge areas within I-680. These impacts would be significant and unavoidable, even after incorporation of mitigation measures. As a result, issues related to air quality and transportation and traffic impacts are potential areas of controversy.”

In assessing the daily impacts to traffic on Johnson Drive, the staff reports:

“Excluding vehicle trip generation from existing uses within the EDZ area, full buildout would generate an estimated 12,160 weekday daily trips (without including pass-by and diverted trips), including 293 morning peak hour, and 743 evening peak hour trips. Saturday trip generation for full buildout is estimated to be 15,630 daily trips (without including pass-by and diverted trips), including 1,310 peak hour trips.”

Their mitigation plan is shown in the graphic above.

However, as astronomical as these increases seem, they may be much less than what actually will happen. In a study conducted in Oklahoma and Texas about traffic generation estimates of traffic around superstore developments, the researchers found that:

“Supercenters of 200,000 square feet or more generate an average of 42 percent more traffic than the rate listed in the Institute of Transportation Engineers Trip Generation manual. Traffic engineers, developers, and city officials use the figures in this manual to estimate the traffic impact of development projects. This study, which relies on traffic counts conducted at five supercenters in Oklahoma and Texas, indicates that the manual significantly underestimates the traffic generated by large supercenters…and that traffic analyses based on it are unreliable indicators of the actual traffic impact of a supercenter development.”

You can read the entire article here.

Another major area of concern is the intersection of Johnson Drive and Owens Drive, which would be a major egress to the proposed development area for those wishing to avoid the traffic on Stoneridge Drive. With the recent addition of a Chick-fil-a at that intersection, where In and Out Burger is already a major draw, driving in that area already is a major headache. The increased trips generated by those wanting to reach Costco could cause backups reaching all the way out to Hopyard Drive and I580.

The mitigation proposed by the Pleasanton Planning team?

Mitigation Measure 4.D-1b: Johnson Drive at Owens Drive (North) Intersection: Install a traffic signal at the Johnson Drive at Owens Drive (North) intersection.