The Advanced Driver and Vehicle Advisory Navigation ConcEpt (ADVANCE) project in the Northwest suburbs of Chicago tested the time effects of dynamic route guidance using a yoked vehicle study on an arterial network with limited probe data. The aggregate data set demonstrated that motorists could reduce travel time by 4 percent under normal or recurring conditions; however, a small sample size and relatively high standard deviation formulated the basis for this result. It did appear that the dynamic route guidance concept, as implemented in ADVANCE, can detect some larger delays and help drivers to avoid them.