Traffic Speed Studies

  • accident
  • car
  • congestion
  • crash
  • speed
  • And 3 more...

Traffic Speed Studies

The Traffic, Parking &Transportation department has conducted over 600 speed studies since 1987. Some locations have been studied more than once. The speed of each passing vehicle is recorded by radar for an hour each in the morning rush hour, evening rush hour, and midday. From these results, we find the 85th percentile speed for each one-hour period. The 85th percentile speed describes a speed that 85% of drivers are traveling slower than (and 15% of people are driving faster than). Traffic engineers use 85th percentile speed for most traffic safety analyses and design standards. In this dataset, the speed reported is the highest 85th percentile speed for all three one-hour periods studied.


NameSocrata field nameColumn name in sgr mountData typeDescription
Location for Mapping (address)location_for_mapping_addresslocation_for_mapping_addressText
Location for Mapping (city)location_for_mapping_citylocation_for_mapping_cityText
Location for Mapping (zip)location_for_mapping_ziplocation_for_mapping_zipText
Location for Mapping (state)location_for_mapping_statelocation_for_mapping_stateText
DirectiondirectiondirectionTextDirection of flow of traffic.
StreetstreetstreetTextName of street being studied.
DatedatedateCalendar dateDate of study.
Posted Limitposted_limitposted_limitTextPosted speed limit in miles per hour (MPH). U = Unposted.
Police Neighborhood Regions:@computed_region_guic_hr4a:@computed_region_guic_hr4aNumber
Police Response Districts:@computed_region_v7jj_366k:@computed_region_v7jj_366kNumber
Cross Streetcross_streetcross_streetTextName of nearest crossing street at observation area OR street number.
LatitudelatitudelatitudeNumberApproximate latitude of the study.
LongitudelongitudelongitudeNumberApproximate longitude of the study.
Speed 85th Percentilespeed_85thspeed_85thNumberThe speed at which 85% of the traffic was clocked slower than.
Location for Mappinglocation_for_mappinglocation_for_mappingPointLocational column for mapping this dataset within Socrata.

Upstream Metadata