"The City's " quick-build" and Slow Streets programs have been especially cost-effective, according to city studies. A quick-build protected bike lane on the Panhandle segment of Fell Street reduced traffic collisions by 40 percent at a cost of only $425,000. On the 28 streets getting quick-build treatment overall, collisions fell by 16 percent. Traffic collisions fell 48 percent on Slow Streets."
"At Embarcadero, the City's proposed protected bike lane extension aims to improve conditions on a popular half-mile segment. However, complex engineering and a plodding planning process have mired the project since 2014; five years alone were spent on community engagement, with SFMTA's project webpage boasting holding "dozens of in-person meetings with key stakeholders." These factors contribute to projected costs of $8 million to $12 million and a timeline extending to 2028."
SFMTA and SFCTA efforts to improve walking and biking infrastructure aim to enhance safety, public health, and transportation options as the City plans for 82,000 new homes. Quick-build and Slow Streets interventions achieved substantial collision reductions at low cost: a Fell Street protected lane cut collisions 40% for $425,000, quick-build streets saw a 16% decline overall, and Slow Streets produced a 48% drop. Larger protected bike lane projects have encountered inconsistent delivery, with examples showing combined cost estimates of $33–$82 million for under two miles, lengthy community engagement, complex engineering, and multi-agency approvals causing multi-year delays.
Read at Streetsblog
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