CMS ROADWAY NETWORK: WHAT ROADS WERE MONITORED

Travel time information is collected on the regionally significant roadways in the Boston region. These include all roadways that are functionally classified as principal/major arterials and all limited-access highways (often called expressways or freeways), as well as some minor arterials. This network comprises about 900 centerline miles (or 1,800 miles, bidirectional) of arterial roadways and 377 centerline miles of limited-access highways—over 10 percent of all roadways in the region. Most state-numbered roadways are included in the monitored network, as are most corridors of the National Highway System.

Click here for a map that shows the monitored roadway network and indicates when the monitoring of each roadway took place.

Click here for a table that lists the monitored roadways, including the year of the most recent travel time data for each route.

In general, volumes on these roadways exceed 10,000 vehicles per day; most of the arterial roadways typically handle over 27,500 vehicles per day on some portion of their length. Volumes on the limited-access highways in the Boston region typically range from 40,000 to 235,000 vehicles per day.

The CMS network is dynamic, too, meaning that additional roads may be monitored in any given monitoring effort; other roadways may not get monitored in consecutive monitoring efforts.