Using this feature requires that you have reliable data about average daily travel for road segments near your project study area. This could be in the form of Average Daily Trips (ADT), Average Annualized Daily Trips (AADT), or Average Annualized Weekday Trips (AAWDT). It is preferable to use data that estimates the share of vehicles that are commercial. This feature is designed for “like” roads, and small- to medium-sized projects. While it will run for “unlike” roads and giant projects, results may not be as accurate. Feel free to contact us if you have questions about finding the right calibration data. We also highly recommend that you use calibration data from the same region and type of roads as your project. For example, don’t calibrate tiny local roads with highway data, or use data from California for a project in Toronto. While it may be fine to calibrate larger arterials with highway data, we anticipate better results from calibration data as similar as possible to your project.
For this tutorial, we found data in Montgomery County, Maryland for 19 segments from Maryland State Highway Administration. They contained recent AADT data, and we estimated the “commercial” percentage by adding together the small trucks and large trucks percentages. If you have no commercial data, you can use the defaults suggested in the StreetLight InSight pop-up information window instead.
Next, draw Zones for each of the four ways out of the intersection, staring with Step 1a, “Add Zone Set.” Name this Zone Set “Louisville Turning Ratios – Destinations.”