The document focuses on research and projects conducted since 2019. Two recent ICM projects are highlighted, including:

  • Tennessee DOT I-24 Smart Corridor – intended to address congestion on I-24 between Davidson County (primarily Nashville) and Rutherford County (primarily Murfreesboro to the south of Nashville). The corridor is 28 miles and includes I-24 and the parallel US Route 41/State Route 1 (see Figure 12).
  • Pennsylvania DOT I-76 ICM – Interstate 76 (Schuylkill Expressway) is the primary freeway between Philadelphia and its north-western suburbs (see Figure 13). The arterial corridors near and parallel to I-76 carry significant commuter traffic. The ICM will implement various technologies to improve operations along the roadway. 

Based on a review of recent documents and findings from the interviews with Tennessee and Pennsylvania DOTs, the study team recommended the following:

  • Consider legacy equipment challenges – A common challenge occurs when ICM developers do not take into consideration the complications of trying to integrate older, out-of-date, equipment.
  • Consider decision support systems (DSS) on a case-by-case basis – DSS have evolved as a common inclusion in ICMs but are not always needed. More complex response plans, or the sheer quantity and variability of the plans, may necessitate a DSS, but areas with fewer or less complex response plans may not need a DSS. 
  • Develop a corridor data policy – Agencies should develop interagency data sharing and security policies early to avoid complications. Developers should define data interface requirements prior to design. 
  • Review Traffic Management Data Dictionary (TMDD) standards during development of the concept of operations –TMDD standards are constantly changing, and a review cycle is recommended throughout the ICM development lifecycle to assure protocols and interfaces are up to date. 
  • Create a central physical or virtual hub – Agencies should establish a central hub, real or virtual, in the development of an ICM network to assure ownership of processing and data archiving.