Effectiveness will be measured immediately after installation, and in three, 3-month intervals in the following ways:
- Before/after speed study on Green Mountain Drive between Valentine Way and Urban Way
- Before/after stop compliance study at Green Mountain Drive at Welch Circle and Wright Street
- General compliance observations at Valentine Way and Urban Way (e.g. yield behavior, intuitiveness of design, near misses/crashes)
We will evaluate maintenance needs to determine if the traffic control devices would be more successful with specific design modifications.
Immediately following the modification of any traffic control device, a higher risk of collisions exists as drivers modify behavior. It is important to recognize that a crash that occurs immediately after modification should be noted; however, long-term increase or decrease of crashes is what is important to observe. Before installation of these measures, variable message signs will help prepare motorists to be aware of the modifications.