All traffic volume figures listed include traffic in both directions unless otherwise indicated.Įach profile breakpoint is identified by the milepost value corresponding to that point on the highway. In addition to the profile breakpoints, these files list county lines and well-known landmarks to aid in orientation. Significant volume changes (breakpoints)in the traffic profile along each route are counted and identified by name and milepost value. Peak hours, peak month ADTs and annual ADTs are shown at each count location. These files list annual traffic volumes for all count locations on the California state highway system. On roads with large seasonal fluctuations in traffic, the peak hour is the four near the maximum for the year but excluding a few (30 to 50 hours) that are exceedingly high and are not typical of the frequency of the high hours occurring during the season. In urban and suburban areas, the peak hour normally occurs every weekday, and 200 or more hours will all be about the same. Unless otherwise indicated, peak hour values indicate the volume in both directions.Ī few hours each year are higher than the "peak hour", but not many. This value is useful to traffic engineers in estimating the amount of congestion experienced, and shows how near to capacity the highway is operating. Included is an estimate of the "peak hour" traffic at all points on the state highway system. planning and designing highways and other purposes. Annual ADT is necessary for presenting a statewide picture of traffic flow, evaluating traffic trends, computing accident rates. The resulting counts are adjusted to an estimate of annual average daily traffic by compensating for seasonal influence, weekly variation and other variables which may be present. Traffic Counting is generally performed by electronic counting instruments moved from location throughout the State in a program of continuous traffic count sampling. Very few locations in California are actually counted continuously. The traffic count year is from October 1st through September 30th. Annual Average Daily Traffic (Annual ADT)Īnnual average daily traffic is the total volume for the year divided by 365 days. Route Number: All California state highways are listed in this booklet in order of Legislative Route number. These files can be imported into spreadsheets or data bases for viewing and analysis. The files containing Traffic Volumes (also known as Traffic Counts) on California state highways are available for downloading. For previous year Traffic Counts, visit the main Traffic Census Program homepage to access available PDF or Excel file by year.
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