Part II of Quiet Cars and the Pedestrian Problem premiers later this week featuring Everett Meyer and Lawrence Rosenblum. Also, if you've ever wondered what one of these quiet cars sounds like, we'll have a chance to listen to a Toyota Prius and compare it to other vehicles.

Everett Meyer is working with a group of graduate students at Stanford University on a sound emitting device that could be used to warn pedestrians that a quiet car is approaching. But, will people pay for it if the device isn't included in the purchase of the vehicle?

Lawrence Rosenblum is a professor of perceptual psychology at the University of California Riverside. He is continuing his research that has uncovered some startling facts about just how quiet hybrid cars can be.

If you find yourself often walking or rolling to destinations or are concerned about this issue you won't want to miss episode 64 of DisabilityNation. Check your email, podcatcher or the web site later this week for more.