Problem 6: Route 146 Arterial Study

Analysis
Our first challenge is to create the TRANSYT-7F input dataset. We’re not going to describe all the details of how to do that here, but we will provide a short description of what’s involved. Dataset 79 is the actual dataset we created.

First, you will need to specify the lane arrangements at the various intersections. Here’s what we decided was appropriate. The abbreviations should be easy to read, and the numbers in parentheses, where they appear, imply more than one lane:

You can revisit the Exhibit 2-2 (the Route 146 aerial photograph) to see if you agree with these decisions. For the first four intersections, you can also review the HCM input datasets. For the I-87 interchange, we only needed to model the westbound-to-northbound entry ramp, westbound-to-southbound left turn onto the southbound entry ramp, the southbound-to-westbound exit ramp, the eastbound-to-southbound entry ramp, and the southbound-to-eastbound exit ramp to capture the impacts of traffic enteLevel of Servicend leaving the system. (If you know TRANSYT-7F, you’ll realize that you can’t model these flows accurately just with the mid-block entry option.) The geometry of the Fire Road intersection was presented in Exhibit 2-48. Exhibit 2-64 contains the configuration of the Route 146 and Route 9 intersection.