For the last several years, "wrapped" buses have acted as moving billboards.
Now, companies are getting family vehicles into the act as well.
By selecting the drivers carefully, advertisers not only get roving promotion... they get product ambassadors who provide word-of-mouth about the advertised store or product to family, friends, acquaintances, and the otherwise curious.
Here's how it works:
Today Show, 12-23-09 -- Jenna Wolfe reporting