• Increase font size
  • Default font size
  • Decrease font size
Home People Mobility


  • The purpose of the mobility reporting category is to summarize the status and trends of indicators used to measure Tahoe’s transportation infrastructure in terms of quality of life and the impacts of vehicle use on air and water quality.
  • The mobility reporting category includes indicators that address the following Pathway desired conditions:
    • Transportation1: Mobility - A multimodal transportation system that provides viable alternatives for all mobility needs and decreases dependency on the private automobile.
    • Transportation 2: Socioeconomic Vitality – The transportation system supports the socioeconomic vitality of the region.
  • The Mobility Reporting Category addresses attainment of adopted TRPA Threshold Standards and includes other information on indicators used to assess the mode of transportation to and within the Lake Tahoe region.

Click here for more information...

  • The Tahoe Regional Planning Agency and the Tahoe Metropolitan Planning Organization are charged with monitoring and improving mobility in the Basin. A few indicators have been measured regularly since the 1970’s, however, additional measurements have been implemented in the last 3 years and several are in review to better track the progress in decreasing reliance on the private automobile for residents and visitors of the Lake Tahoe Basin. Additionally, these agencies are working to provide both visitors and residents with the resources necessary to facilitate the use of alternative modes of transportation, modes other than the automobile.
  • The following indicators and adopted Threshold Standards are addressed under the Mobility Reporting Category:
    • “Management Standard” (for the Air Quality Threshold Category) – Reduce vehicle miles traveled (VMT) in the Basin by 10% of the 1981 base year values. The 1981 baseline for modeled VMT was estimated to be 1,649,000 vehicle miles traveled for peak summer days using the Quick Response System Transportation Model.
      • One indicator is used to judge compliance with the Vehicle Miles Traveled Threshold Standard, it is:
        • Vehicle Miles Traveled – is a modeled estimate of the total miles of vehicle travel in the Lake Tahoe basin for a peak summer day (the second Friday in August). This indicator is a computed value that measures the extent of travel for a given area.
    • “Management Standard” (for the Air Quality Threshold Category) – Reduce traffic volumes on the U.S. 50 Corridor by 7% during the winter from 1981 base year between 4:00pm and 12:00 midnight, provided that those traffic volumes shall be amended as necessary to meet the respective State [air quality] standards. The 1981 baseline traffic volume was established for the Saturday of President's Day Holiday Weekend to be 25,173.
      • Two indicators are used to judge compliance with the traffic volume Threshold Standard:
  • Additional indicators were identified as part of the Pathway planning process to address attainment of Pathway desired conditions for transportation. They are are used to measure use of alternative modes of transportation in the Tahoe Region and include:
  • Reduction in traffic volumes and vehicles miles traveled is believed to indicate improved air quality through reduced carbon monoxide and particulates, and improved water quality through the reduction in atmospheric nitrogen and particulates deposited in Lake Tahoe.
  • Indicators showing an increase in non-automobile use could indicate improved air and water quality as fewer cars are contributing to air and water pollution.
  • The current roadway system and associated levels of traffic contribute to excessive airborne pollutants (re-entrained dust) and runoff (fine sediment). Runoff from roads and deposition from atmospheric sources are the biggest contributors to the degradation of Lake Tahoe's water clarity.
  • As in most locations in the United States, the majority of trips in the Lake Tahoe Basin are generated by private automobiles. However, there is limited capacity in the basin to accommodate additional trips using this mode of transportation.
  • A summary of the TRPA's monitoring program can be found below and in the report "Mobility 2030: Transportation Monitoring Program".


In assessing the progress of improving the quality of these attributes, the following indicators are measured on a regular basis. Click on the titles to open the indicator page.

Non-Auto Mode Share within and into the Basin
Percentage of Travel to Recreation Sites via Non-Auto Modes
Percentage of Travel to Commercial Core Areas via Non-Auto Modes
Average Monthly Winter Traffic Volumes; 2002-2006
Traffic Volumes, Saturday of Presidents Day Holiday Weekend
Lake Tahoe Region 1982-2008 VMT Based on Percentage Increase-Decrease in Annual Traffic Counts
Last Updated on Thursday, 04 October 2012 11:58