would have required several lane changes. the better course was for the autonomous vehicle to come to a safe stop rather than proceed. while other drivers cruised right past that closed lane, our car sat parked on a busy street for 20 minutes, causing a traffic jam for blocks. what s your reaction it being a driverless car stuck here? i m not surprised. reporter: self-driving cars are already being tested in 25 states, but with no federal regulation, america doesn t have a national road map for safety guidelines. back inside our car, cruise customer service contacted us to say they detected a problem. their solution? they sent us a driver to get behind the wheel. bigad shaban, nbc news, san francisco. we ll take a break, and then up next, from taylor swift to barbie, how women are powering this summer s biggest hits. ne if you h have heart t disease and are e on a statitin, lowewering cholelesterol can be harard. and d diets and d exercise add to t the strugglgle.
of a stolen vehicle. in all, nearly 100 factors were put into a data base and analyzed these included physical characteristics of the vehicle and vehicle driving behavior importantly, nothing about the driver s racial profile these elements are called enrichment factors, essentially hallmarks of a stolen vehicle. for example, a missing license plate, broken window, no lights, and abnormal lane changes. as the theory goes, the more enrichment factors, the more likely it is a stolen car. when we look at a vehicle like this, you look at the fact there are no plates on the vehicle. their driving was erratic and inappropriate. that is another factor that made them realize it and then when they tried to initiate a traffic stop it ran. it eluded. reporter: right. so stolen car. reporter: it all adds up. correct correct. then the driver also has a warrant for his arrest. reporter: to better understand the numbers portland police turned to an unlikely partner cancer researchers at