Vision Zero comments

Here are my comments on the draft Vision Zero Action Plan for Sacramento. Most of these were posted on the boards at the 2018-01-31 meeting, and in email to the city.

  • Sacramento essentially has no traffic enforcement currently. More about this tomorrow.
  • I was concerned by the prominence of the bicyclist fatalities increasing 150% without any contextual information. As with any data point with small numbers, as bicyclist KSI (killed and severely injured) is with respect to pedestrian and vehicular KSI, noise can lead to apparently huge changes that may not indicate a pattern. It would be sad if that one statistic were used to argue that changes to protect bicyclists should be prioritized, when it is clear from all the other data in the plan that pedestrians are at the greatest risk.
  • If 78% of KSI occurred at intersections, issues can be addressed more quickly and cheaply by focusing on intersections rather than corridors.


All profiles should have the DAC/CES overlay, not just profile 3.

  • Profile 1: unsafe speed and profile 3: 35+ streets: Street Narrowing should say Street Narrowing and Speed Limit Reduction
  • Profile 4: 30+ streets should include lane narrowing
  • Profile 5: broadside: is there evidence that adding signals reduces crashes, anecdotal evidence would argue that it increases crashes
  • What does no bullets for efficacy mean, that there is no benefit, or that there is insufficient research?

I asked about why there was a 30+ and a 35+ profile. The answer is that collision characteristics change considerably between 25 and 35, with 30+ being an issue for bicyclists, and 35+ being an issue for all modes.

Vision Zero Actions (p. 45-50)

  • 1.5 Launch online, interactive crash data map and website. > short-term
  • 2.2 Install 10 low-cost safety improvements, including new road markings, signs, and minor signal modifications per year. > 10 locations
  • 2.3 Develop prioritized list and deliver half of engineering safety projects on the HIN in Disadvantaged Communities (commensurate with share of fatal collisions). > separate so that list is short-term, deliver is long-term
  • 4.4 Install school zones at all schools. > what about reductions at qualified locations?
  • 5.4 Update City signal timing policy to improve safety for all modes (e.g. all red time, pedestrian crossing times). > should include specific mention of LPI at high-pedestrian or high-collision intersections

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s