The I-5 Widening EIS’s Incomplete Traffic Study
By now, it’s too late to defeat the proposed widening of the I-5 between the vicinity of SR 91 and I-605 in Los Angeles County. The Final Environmental Impact Statement, which is mercifully available in English, was released this summer, meaning the chance for the public to comment officially is over. Unofficially, it’s never too late to kill a project until the spades are in the ground.
The widening would take the current 6-lane stretch of road and widen it two more lanes in each direction. One of the given reasons to complete the project is because it will reduce carbon emissions. On page 162 (172 in your pdf file) of the EIS it says:
It should be noted that although traffic volumes are expected to
increase from their existing levels, the decrease in emission factors due to
improved technology and lower ambient levels would more than offset the
increase in CO emissions from increased traffic volumes.
However, as discussed here last week, increasing lane miles will also increase the amount of traffic on the road. The EIS/EIR for this project doesn’t take into account that the widened Route 5 will attract more traffic (and thus will create more traffic for SR 91, I-605 and the 405) than an un-widened road. The traffic study assumes that a widened I-5 will see the same increase in traffic as an-unaltered road so emissions will go down as congestion goes down.