Data Dictionary file for the dataset collection.

Data Dictionary_Crash Data on State Highway System

2021 Crash Data on State Highway System

Total centerline miles of State Highways reported for each of the lane types for the published year (2021). Centerline miles represent the total length of a given road from a start point to an end point. 

Total number of vehicle miles that motorists travel on the State Highway System (SHS). The travel data is expressed in million vehicle miles (MVM) of travel and reported for the published year (2021)

All crash (fatal, injury and property damage only) combined rate for each of the SHS lane types for the published year (2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatal and injury crash combined rate for each of the SHS lane types for the published year (2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatality rates for each of the SHS lane types for the published year (2021). A fatality rate is the number of fatalities that occur at a given time period divided by travel data per 100 million vehicle miles (100 MVM) of travel for the same period. 

All crash (fatal, injury and property damage only) combined rate for each of the SHS lane types for a three year period - two prior years plus the published year (2019, 2020, 2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatal and injury crash combined rate for each of the SHS lane types for a three year period - two prior years plus the published year (2019, 2020, 2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatality rates for each of the SHS lane types for a three year period - two prior years plus the published year (2019, 2020, 2021). A fatality rate is the number of fatalities that occur at a given time period divided by travel data per 100 million vehicle miles (100 MVM) of travel for the same period. 

Indicates whether the highway characterized by lane type is in the rural or urban area, and inside or outsite the city boundary. The rural and urban area limits are based on population density as determined by US Census Bureau. While the urban/rural area dataset is maintained by US Census Bureau, the California city boundary layer is updated and managed by California State Board of Equalization. 

Calendar year for which the statewide travel data and crash rates are reported - four prior years plus the published year (2017, 2018, 2019, 2020, 2021).

Total centerline miles of State Highways reported for each of the five years as listed in the table (2017, 2018, 2019, 2020, 2021). Centerline miles represent the total length of a given road from a start point to an end point.


Total number of vehicle miles that motorists travel on the SHS. The travel data is expressed in million vehicle miles (MVM) of travel and reported for the five years as listed in the table (2017, 2018, 2019, 2020, 2021). 

Total number of crashes (fatal crashes, injury crashes, and property damage only crashes) occurred on the SHS for the five years as listed in the table (2017, 2018, 2019, 2020, 2021). 

Total number of property damage only  (PDO) crashes occurred on the SHS for the five years as listed in the table (2017, 2018, 2019, 2020, 2021). 

Total number of injury related crashes occurred on the SHS for the five years as listed in the table (2017, 2018, 2019, 2020, 2021). 

Total number of fatal crashes occurred on the SHS for the five years as listed in the table (2017, 2018, 2019, 2020, 2021). 

Total number of victims killed associated with fatal crashes occurred on the SHS for the five years as listed in the table (2017, 2018, 2019, 2020, 2021). 

All crash (fatal, injury and property damage only) combined rate for the five years as  listed in the table (2017, 2018, 2019, 2020, 2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatal and injury crash combined rate for the five years as listed in the table (2017, 2018, 2019, 2020, 2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatality rates for the five years as listed in the table (2017, 2018, 2019, 2020, 2021). A fatality rate is the number of fatalities that occur at a given time period divided by travel data per 100 million vehicle miles (100 MVM) of travel for the same period. 

Urban or rural area that State Highways transverse through by each district. The rural and urban area limits are based on population density as determined by US Census Bureau. The urban and rural boundary dataset is maintained by US Census Bureau. 

Listing showing different highway types based on number of lane, access control, median type.

Total number of vehicle miles that motorists travel on the SHS. The travel data is expressed in million vehicle miles (MVM) of travel and reported for the published year (2021). 

Total number of crashes (fatal crashes, injury crashes, and property damage only crashes) occurred on the SHS for the published year (2021). 

Total number of property damage only (PDO) crashes occurred on the SHS for the published year (2021).

Total number of injury related crashes occurred on the SHS for the published year (2021). 

Total number of fatal crashes occurred on the SHS for the published year (2021). 

Total number of victim killed associated with fatal crashes occurred on the SHS for the published year (2021). 

Total number of victim injured associated with crashes occurred on the SHS for the published year (2021). 

All crash (fatal, injury and property damage only) combined rate for the published year (2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatal and injury crash combined rate for the published year (2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatality rates for SHS lane types for the published year (2021). A fatality rate is the number of fatalities that occur at a given time period divided by travel data per 100 million vehicle miles (100 MVM) of travel for the same period. 

The Caltrans District or District number for which State Highways transverse through.


Total centerline miles of State Highways reported by each of the 12 Caltrans districts for the published year (2021). Centerline miles represent the total length of a given road from a start point to an end point. 

Total number of vehicle miles that motorists travel on the SHS by each Caltrans district. The travel data is expressed in million vehicle miles (MVM) of travel and reported for the published year (2021). 

Total number of crashes (fatal crashes, injury crashes, and property damage only crashes) occurred on the SHS by each Caltrans district for the published year (2021). 

Total number of property damage only (PDO) crashes occurred on the SHS by each Caltrans district for the published year (2021). 

Total number of injury related crashes occurred on the SHS by each Caltrans district for the published year (2021). 

Total number of fatal crashes occurred on the SHS by Caltrans district for the published year (2021). 

Total number of fatalities associated with crashes occurred on the SHS by each Caltrans district for the published year (2021). 

Total number of injuries associated with crashes ocurred on the SHS by each Caltrans district for the published year (2021). 

All crash (fatal, injury and property damage only) combined rate for the published year (2021) by each Caltrans district. A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatal and injury crash combined rate for the published year (2021) in each Caltrans district. A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatality rates for the published year (2021) by each Caltrans district. A fatality rate is the number of fatalities that occur at a given time period divided by travel data per 100 million vehicle miles (100 MVM) of travel for the same period. 

The Caltrans District or district number for which State Highways transverse through.


Total centerline miles of State Highways reported for each of the lane types for each Caltrans district for the published year (2021). Centerline miles represent the total length of a given road from a start point to an end point. 

Total number of vehicle miles that motorists travel on State Highways for  each district for the published year (2021). The travel data is expressed in million vehicle miles (MVM) of travel and reported for the published year (2021). 

Total number of crashes (fatal crashes, injury crashes, and property damage only crashes) occurred on each SHS lane type for each Caltrans district for the published year (2021). 

Total number of property damange only (PDO) crashes occurred on each SHS lane type for each Caltrans district for the published year (2021).

Total number of injury relatedcrashes occurred on each SHS lane type for each Caltrans district for the published year (2021). 

Total number of fatal crashes occurred on each SHS lane type for each Caltrans district for the published year (2021). 

Total number of fatalities associated with fatal crashes occurred on each SHS lane type for each Caltrans district for the published year (2021). 

Total number of injuries associated with crashes occurred on each SHS lane type for each Caltrans district for the published year (2021). 

All crash (fatal, injury and property damage only) combined rate for each SHS lane type for each district the published year (2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatal and injury crash combined rate for each SHS lane type for each Caltrans district for the published year (2021). A crash rate is the number of crashes that occur at a given time period divided by travel data per million vehicle miles (MVM) of travel for the same period. 

Fatality rates for each SHS lane type for each Caltrans district for the published year (2021). A fatality rate is the number of fatalities that occur at a given time period divided by travel data per 100 million vehicle miles (100 MVM) of travel for the same period. 

Urban or rural area for each district that State Highways transverse through. The rural and urban area limits are based on population density as determined by US Census Bureau. The urban and rural boundary dataset is maintained by US Census Bureau. 

Name of county for which State Highways transverse through.

Total centerline miles of State Highways reported for each of the lane types for each county for the published year (2021). Centerline miles represent the total length of a given road from a start point to an end point. 

Total number of vehicle miles that motorists travel on State Highways in each county for the published year (2021). The travel data is expressed in million vehicle miles (MVM) of travel and reported for the published year (2021). 

Total number of crashes (fatal crashes, injury crashes, and property damage only crashes) occurred on each SHS lane type for each county for the published year (2021). 

Total number of property damange only (PDO) crashes occurred on each SHS lane type for each county  for the published year (2021).

Total number of injury related crashes occurred on each SHS lane type for each county for the published year (2021). 

Total number of fatal crashes occurred on each SHS lane type for each county for the published year (2021). 

Total number of fatalities associated with fatal crashes occurred on each SHS lane type for each county for the published year (2021). 

Total number of injuries associated with crashes occurred on each SHS lane type for each county for the published year (2021). 

Urban or rural area for each County that State Highways transverse through. The rural and urban area limits are based on population density as determined by US Census Bureau. The urban and rural boundary dataset is maintained by US Census Bureau. 

Groups of state highway facilities (highway segment, ramp and intersection) that have similar features or characteristics (number of lane, access control, median type, terrain, design speed, area type and average daily traffic). Rate group is used a measure to identify high crash concentration location along the State Highway System (SHS).  The SHS is classified into 67 Highway Rate Groups, 31 Intersection Rate Groups, and 80 Ramp Rate Groups.

Statewide average crash rate for each specific highway rate group. 

Value to be added to the base rate for some highway rate group to account for variation in traffic data within those highway rate group. Avaregage data traffic (ADT)  factor is the slope of a linear function of crash rates and ADT. 

Percentage of fatal related crashes for specific Highway Rate Group

Percentage of injury related crashes for specific Highway Rate Group

Percentage of fatal + injury  crashes for specific Highway Rate Group

Types of highway segments based on number of lanes, median type, and access control for specific Highway Rate Group

Terrain: identifies the general characteristics of the terrain where State Highway transverse through, should be descriptive of the adjacent topography. 
Average Daily Traffic: the average number of vehicles per day that travel over a specific section of highway.

A speed selected to establish specific minimum geometric design elements for a particular section of highway. This is the average maximum safe speed for a passenger car during the extremely low traffic density. Design speed information is extracted from project as built plans. 

Area type (rural, urban or suburban) for each specific Highway Rate Group. The urban and rural area limits are based on population density as determined by the U. S. Census Bureau.

Crash Cost ($1000) for fatal and injury combined crashes for each specific Highway Rate Group. 

Crash Cost ($1000) for all crash types combined for each specific Highway Rate Group. 

Statewide average crash rate for each specific intersection rate group. 

Value to be added to the base rate for some highway rate group to account for variation in traffic data within those highway rate group. Avaregage data traffic (ADT)  factor is the slope of a linear function of crash rates and ADT. 
ADT factor is not applicable to intersection rate groups. 

Percentage of fatal related crashes for specific Intersection Rate Group

Percentage of injury related crashes for specific Intersection Rate Group

Percentage of fatal + injury  crashes for specific Intersection Rate Group

Listing of intersecion geometry type assigned to each specific Intersection Rate Group

Listing of intersecion control type assigned to each specific Intersection Rate Group

Crash Cost ($1000) for fatal and injury combined crashes for each specific Intersection Rate Group. 

Crash Cost ($1000) for all crash types combined for each specific Intersection Rate Group. 

Statewide average crash rate for each specific ramp rate group. 

Value to be added to the base rate for some highway rate group to account for variation in traffic data within those highway rate group. Avaregage data traffic (ADT)  factor is the slope of a linear function of crash rates and ADT. 
ADT factor is not applicable to ramp rate groups. 

Percentage of fatal related crashes for specific Ramp Rate Group

Data Dictionary_Crash Data on State Highway System

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