An acronym standing for "Phone, Asian, Chick
, Elderly," stereotypically considered the four worst categories of drivers (i.e., people talking on cell phones, people of Asian decent, women and old people). Similar to a pace car in NASCAR, the PACE car usually sets the pace for the flow of traffic by driving slowly or erratically in front of cars wishing to pass or drive faster. Once the PACE car gets out of the way, traffic will return to normal speeds and predictability. Often other drivers in the rear of the pack will guess which category the PACE car driver belongs to before seeing the driver when and if they are finally able to pass.
Be careful honey, it looks like there's a PACE car up ahead creating a bottleneck in the flow of traffic. At first I thought they were looking for an address or parking space but now I can see its just a PACE car. What kind of PACE car do you think it will turn out to be?