The information provided is compiled from metrics and information discussed within the 2020 Jackson/Teton County Integrated Transportation Plan.
The ITP is based on the multimodal transportation vision outlined in the 2020 update to the Town and County Comprehensive Plan and implements policies, goals, and objectives developed in Chapter 7 of said plan, which is summarized as follows:
“Travel by walk, bike, carpool, or transit will be more convenient than travel by single-occupancy vehicle.”
A Technical Advisory Committee made up of the staff of the Town, County, and Wyoming Department of Transportation(WYDOT) guided the planning process throughout 2014-2015 and again in 2019-2020. The original 2015 ITP also involved extensive public outreach, including interviews with community leaders and two public workshops attended by more than 190 people. (ITP, pg 4)
The Town and County will maintain and annually update a transportation indicators report as part of the annual publication of the annual Jackson/Teton County Comprehensive Plan Indicator Report. The transportation indicators report will monitor seven key indicators, listed below, and will be used to evaluate how effectively the Town and County are reaching the transportation-related goals identified in the Comprehensive Plan. The Town and County will also continue improving techniques for monitoring active transportation activity levels and trends. (ITP pg 26)
ITP Transportation Indicators
- Annual Vehicle Miles Traveled in Jackson Hole
- Annual START Ridership
- Average Daily Summer VMT per Capita*
- Average Monthly Summer START Ridership per Capita*
- Annual Tons of Mobile Source GHG Emissions
- Travel Time Differential – Bus/SOV
Upon discussion with Teton County and the Town of Jackson staff, slight modifications were made, allowing for improved data collection, reporting, and analysis.
Below summarizes the methodology and general definition for each metric provided.
Vehicle Miles Traveled (VMT) – VMT measures the amount of travel for all vehicles in a geographic region over a given period of time, typically a one-year period. It is calculated as the sum of the number of miles traveled by each vehicle (StreetLight Data). This metric is provided for annual and seasonal time periods within the boundary of Teton County and the Town of Jackson. The StreetLight Data Insight Zone Activity Analysis was utilized for this analysis. A Zone Activity Analysis calculates the average trip length and average daily zone traffic. This includes all trips that start and end in the zone, regardless of either origin or destination. Below is the calculation used to generate VMT. Additional VMT information and metrics are provided in Section– Regional Transportation Patterns.
Total Vehicle Miles Traveled per time period =
Avg All Trip Length (mi) x Average Daily Zone Traffic (StreetLight Volume) x number days within time period
START Ridership – This information was collected from START operations. In the future, additional and improved data will be available as START begins to integrate improved Transportation Integrated Systems. Additional START information and metrics are provided in Section– Transit Indicators.
Annual Tons of Mobile Source GHG Emissions – GHG emissions include gases, such as carbon dioxide and methane, contributing to potential climate change. A gas that absorbs infrared radiation in the atmosphere. Greenhouse gases include but are not limited to water vapor, carbon dioxide, methane, nitrous oxide, hydrochlorofluorocarbons, ozone, hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride. For this calculation, the use of Total Annual Vehicle Miles and a multiplier provided below is applied to estimate the GHG emissions (Greenhouse Gas Emissions from a Typical Passenger Vehicle | US EPA). A Climate Adaptation Program and other groups within the area are collecting more detailed methodologies to calculate GHG, allowing for improved GHG metrics in the future.
Travel Time Differential – The average travel time difference between the different modes (vehicle, bike, and pedestrian) of transportation to get between two locations. The StreetLight Data Insight Zone Activity Analysis was utilized for this analysis. Additional Travel Time Differential information and metrics are provided in Section– Regional Transportation Patterns.
Average Travel Time – this is the trip time for the full trip. While the duration is calculated in seconds, the distribution bins are in minutes. Additional Average Travel Time information and metrics are provided in Section – Regional Transportation Patterns.