Our participation in the completion of The Leonard P. Zakim, Bunker Hill Bridge, the centerpiece project of the "Big Dig", Boston MA.

Rumble Strips

Rumble Strips
the challenge
Roadway departures account for more than half of all roadway fatalities. Roadway departure fatalities, which include run-off-the-road and head-on fatalities, are a serious problem in the United States. Driver fatigue, drowsiness, careless and distracted driving, and visibility are all contributing factors to accidents of this nature. 70% of these fatalities occur on rural roads, and 90% are on two lane roads. Inclement weather can obscure pavement marking visibility, causing drivers to run off the road accidentally.
the solution
Shoulder rumble strips have proven to be very effective for warning drivers that they are about to drive off the road. Numerous studies have shown a very high benefit-to-cost ratio for rumble strips, making them among the most cost-effective safety features available. Rumble strips are grooved patterns on the roadway that provide both an audible warning (rumbling sound) and a physical vibration to alert drivers that they are leaving the driving lane. Some States paint stripes over the rumble strips to make them visible; these are called rumble stripes. There are three types of rumble strips. The most common type of strip is the continuous shoulder rumble strip. These are located on the road shoulder to prevent roadway departure crashes on expressways, interstates, parkways, and two-lane rural roadways. Centerline rumble strips are used on some two-lane rural highways to prevent head-on collisions. Transverse rumble strips are installed on approaches to intersections, toll plazas, horizontal curves, and work zones.

Rumble Strip Specifications >>
Locations in Ohio, Maryland, Virginia, Florida and Wisconsin.