2011 OTS Rankings
Select a City or County from one of the dropdown lists and click on the Show City or Show County button.
Reading and Understanding the OTS Rankings
- What are the OTS Rankings?
- How are the OTS Rankings determined?
- How to Read and Understand the OTS Rankings
The OTS Rankings were developed so that individual cities could compare their city’s traffic safety statistics to those of other cities with similar-sized populations. Cities could use these comparisons to see what areas they may have problems in and which they were doing well in. The results helped both cities and OTS identify emerging or on-going traffic safety problem areas in order to help plan how to combat the problems and help with the possibility of facilitating grants. In recent years, media, researchers and the public have taken an interest in the OTS Rankings. It should be noted that OTS rankings are only indicators of potential problems; there are many factors that may either understate or overstate a city/county ranking that must be evaluated based on local circumstances.
NOTE: City rankings are for incorporated cities only. County Rankings include all roads – state, county and local – and all jurisdictions – CHP, Sheriff, Police and special.
- Victim and collision data for the rankings is taken from the latest available California Highway Patrol (CHP) Statewide Integrated Traffic Records System (SWITRS) data.
- Victim and collision rankings are based on rates of victims killed and injured or fatal and injury collisions per “1,000 daily-vehicle-miles-of-travel" (Caltrans data) and per “1,000 average population" (Department of Finance data) figures. This more accurately ensures proper weighting and comparisons when populations and daily vehicle miles traveled vary.
- DUI arrest totals and rankings are calculated for cities only and are based on rates of non-CHP DUI arrests (Department of Justice data). This is so that local jurisdictions can see how their own efforts are working.
- Counties are assigned statewide rankings, while cities are assigned population group rankings.
Top Horizontal Bar:
- Agency – local jurisdiction that the data applies to.
- Year – the year the data represents. The rankings are updated once per year when all component statistics and data have been reported.
- County – county in which the city is located.
- Group – Cities are grouped by 2011 population:
- Group A – 13 cities, populations over 250,000
- Group B – 55 cities, population 100,001-250,000
- Group C – 102 cities, population 50,001-100,000
- Group D – 94 cities, population 25,001-50,000
- Rankings for smaller cities are not included on-line, but are available through the OTS Public Affairs Office.
- Population – estimates matched to “Year”
- DVMT – Daily Vehicle Miles Traveled. Caltrans estimate of the total number of miles all vehicles traveled on that city’s streets on an average day during that year.
- The number of cities in each group varies by year.
IMPORTANT NOTE #1: The figures in the two ranking columns show as two numbers divided by a slash. The first number is that city’s ranking in that category. The second number is the total number of cities/counties within that “Group”. For instance, if you see “22/53”, that means that city ranks 22nd out of 53 cities of similar size.
IMPORTANT NOTE #2: OTS Rankings are calculated so that the higher the number of victims or collisions per 1000 residents in a population group, the higher the ranking. Number 1 in the rankings is the highest, or “worst.” So, for Group B, a ranking of 1/53 is the highest or worst, 27/53 is average, and 53/53 is the lowest or best.
- Type of Collision – This column delineates the different types of collisions OTS has chosen to show in the rankings. These represent the types with larger percentages of total killed and injured and areas of focus for the OTS grant program. Motorcycles were added in 2008.
- Victims Killed and Injured – This column shows the number of fatalities and injuries aggregated. Damage-only or fender-bender collisions are not included.
- Ranking by daily vehicle miles traveled – This column weighs this city against all others in the Group when looking at DVMT. Cities of like size may have widely varying rates of traffic, a factor which can be meaningful on a local basis. Significant differences between this and the population column must be evaluated based on local circumstances.
- Ranking by population – This column weighs this city against all others in the Group based on population. Population can be a meaningful basis for comparison. Significant differences between this and the Daily Vehicle Miles Traveled column must be evaluated based on local circumstances.
- Total Fatal and Injury – The total number of victims involved in all collisions where there were fatalities and/or injuries in that city/county.
- Alcohol Involved – Collisions in which there were victims killed or injured where a party (driver, pedestrian, bicyclist) was classified as “Had Been Drinking.”
- HBD Driver <21 – Collisions in which there were victims killed or injured where a driver who was under the age of 21 had been drinking.
- HBD Driver 21-34 – Collisions in which there were victims killed or injured where a driver who was between the ages of 21 and 34 had been drinking.
- Motorcycles - Collisions in which there were victims killed or injured and a motorcycle was involved.
- Pedestrians - Collisions in which there were victims killed or injured and a pedestrian was involved.
- Pedestrians <15 - Collisions in which there were victims killed or injured and a pedestrian under the age of 15 was involved.
- Pedestrians 65+ - Collisions in which there were victims killed or injured and a pedestrian age 65 and older was involved.
- Bicycles - Collisions in which there were victims killed or injured and a bicyclist was involved.
- Bicycles <15 - Collisions in which there were victims killed or injured and a bicyclist under age 15 was involved.
- Composite – Figures which show rankings only, an aggregate of several of the other rankings (HBD 21-34, HBD Under21, Alcohol Involved victims plus Hit & Run, Nighttime and Speed collisions). These figures are a means to give an indication of over-all traffic safety.
- Speed Related – Collisions in which there were victims killed or injured where speed was the primary factor.
- Nighttime (9:00pm - 2:59am) – Collisions in which there were victims killed or injured that occurred between those hours, which are prime hours for DUI, speeding and drowsy driving crashes.
- Hit and Run – Collisions in which there were victims killed or injured and a driver left the scene.
- DUI Arrests – DUI arrest figures are shown for cities only, not counties.
The first figure gives the total number of DUI arrests for the year on city streets. The second number shows the percentage of the city’s estimated licensed drivers that was arrested for DUI during that year. The current statewide average is .90%. Local percentages shown give an indication of how cities compare against the average. Lower than .90% means lower than the state average and higher than .90% means higher that the state average. However, differences can be from many factors and must be evaluated based on local circumstances.
Cities often use this measure to determine how to adjust their DUI enforcement activity. When increased DUI enforcement is combined with education and public information campaigns, it can lead to a reduction of the incidence of DUI.
“0” Note: Cities reporting 0 victims and/or collisions for a category or 0 DUI arrests are ranked using the variable upon which the ranking is based. For example, if 10 of 93 cities in population group D reported 0 hit-and-run fatal and injury collisions when ranking by per “1,000 average population,” the city with the highest population of these 10 cities would be ranked 93/93, and the city with the lowest population of these 10 cities would be ranked 84/93. The same methodology has been applied when ranking per “1,000 daily-vehicle-miles-of-travel” and per “estimated average number of licensed drivers.”