Short answer: Robertson and La Cienega if we adjust for traffic volume, or Santa Monica, Sunset, and Fountain if we don’t

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In a recent report, we analyzed when traffic collisions happen in West Hollywood. In this report, we look at where they happen.


Reported collisions

Our analysis is based on 2,625 collisions reported between 2015 and 2017. The annual number dropped over the three-year period. There were over 1,000 in 2015. In 2016, the number declined to roughly 800. For 2017, the preliminary count is below 800.

Note: The 2013 and 2014 totals are too incomplete to show. Sources: California Highway Patrol, Statewide Integrated Traffic Records System (SWITRS), records processed through March 21, 2018; our analysis.


Collisions by intersection

A third of reported collisions occurred within 10 feet of an intersection. The 10 intersections with the most collisions were on La Cienega (2), Santa Monica (4), and Fountain (4):

  • La Cienega & Sunset and La Cienega & Melrose
  • Santa Monica & Robertson, Santa Monica & San Vicente, Santa Monica & Crescent Heights, and Santa Monica & La Brea
  • Fountain & Havenhurst, Fountain & Crescent Heights, Fountain & Hayworth, and Fountain & Fairfax

Together, those intersections represented a quarter of collisions in intersections or 8% of the overall total. The intersection with the most collisions had less than 1% of the overall total.

10 INTERSECTIONS WITH THE MOST REPORTED COLLISIONS — 2015-2017

Note: Includes collisions within 10 feet of the intersection. Sources: Same as above.


Collisions by street

About 80% of all collisions happened on (or at an intersection with) one of 13 major streets. Three of those streets — Santa Monica, Sunset, and Fountain — together accounted for more than 50%. Santa Monica, all by itself, had 25% of the collisions.

Note: Includes collisions on intersecting streets within 10 feet of the intersection. Because of that, the percentages shown in the chart shouldn’t be added together if the streets intersect. Sources: Same as above.


Collision risk by street segment: 2014-2015

Santa Monica, Sunset, and Fountain are among the most heavily traveled streets in the city, so it’s not a surprise that they also have a large share of collisions. But if we adjust for traffic volume and length, are they the riskiest?

One of the City’s engineering firms did the calculations for major street segments using data from 2014 and 2015. It turns out that drivers on Robertson faced the highest risk of a collision. Robertson had 6.9 collisions per million vehicle miles.

The southern part of La Cienega around Melrose came in second, with 6.6 collisions per million vehicle miles. Third place went to Doheny north of Santa Monica. The rest of the top 10 were La Brea, San Vicente (north of Santa Monica), Crescent Heights (north of Santa Monica), Holloway, the northern stretch of La Cienega, Doheny Road, and Fairfax.

Santa Monica, Sunset, and Fountain weren’t in the top 10.

Note: We’re not showing streets with lower traffic volumes for technical reasons. Source: KOA, “2016 Traffic Speed Zone Survey: City of West Hollywood,” October 2016.


Collision risk by street: 2015-2017

We updated the collision risk estimates using more recent collision and traffic data. Our numbers are higher, in part because we counted some collisions on intersecting streets.

Robertson was still number one for collision risk over the last three years, 2015 to 2017. La Cienega was still number two. Holloway moved up into the number three spot. La Brea held at number four.

Santa Monica, Sunset, and Fountain weren’t near the top for collision risk.

Note: For streets with multiple traffic volume estimates, we took a simple average. Sources: SWITRS; City of West Hollywood, Open Data, Citywide Traffic Volumes, updated June 28, 2017; KOA (for Holloway traffic volume); our analysis.


http://wehobythenumbers.com/wp-content/uploads/2018/03/201803-where-collisions-intersection-map-v2.jpghttp://wehobythenumbers.com/wp-content/uploads/2018/03/201803-where-collisions-intersection-map-v2-300x300.jpgDavid WarrenPerformance (effectiveness)Public safetyTransportationdriving,streets,traffic
Short answer: Robertson and La Cienega if we adjust for traffic volume, or Santa Monica, Sunset, and Fountain if we don't| In a recent report, we analyzed when traffic collisions happen in West Hollywood. In this report, we look at where they happen. Reported collisions Our analysis is based on...