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Traveler Information > En Route Information > In-Vehicle Systems


Regional and/or multimodal traveler information programs intended for travelers en-route to their destinations may make use of 511 telephone systems, in-vehicle devices, radios, or other wireless devices such as pagers and PDAs.


Evaluation of an In-Vehicle Active Traffic and Demand Management System finds that 73 percent of participants favor the technology(04/04/2016)

In networks with work zones, connected vehicle market penetration rates under 40 percent may contribute to a safer traffic network, while market penetrations above 40 percent may decrease network safety.(03/24/2015)

A mileage-based user fee study in Minnesota generated nearly $38,000 in simulated revenue over six months.(02/01/2013)

Audible "slow traffic ahead" alerts can improve drivers' situational awareness and increase safety on freeways.(June 2011)

In the Puget Sound region, 46 percent of traveler information seekers surveyed benefited from an in-vehicle device that provided freeway traffic information.(April 2010)

Travelers that used in-vehicle devices to alert themselves of freeway traffic congestion reportedly saved an average of 30 minutes each time they used the information to change their travel routines.(April 2010)

Simulation models show that real-time on-board driver assistance systems that recommend proper following distances can improve fuel economy by approximately 10 percent.(21-25 September 2009)

Intelligent speed control applications that smooth traffic flow during congested conditions can reduce fuel consumption by 10 to 20 percent without drastically affecting overall travel times.(2009)

In 1999, a study in Seattle, Washington indicated that participants who used traveler information devices including wrist watches, in-vehicle components, and portable computers found the information was useful for making travel decisions.(5 January 1999)

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