They normally will take you away from the passenger side of the car to point out the " Fault" on your vehicle whilst one of their number will sneak and open the passenger door and take valuables from within.Ladies normally leave their handbags in the footwell of the car and that is their target. These people operate in gangs and may travel in two or three vehicles .Many couples have lost airline tickets,Money and passports etc this way.Think of the drama this would cause on your way home/Start of your holiday. You will be surprised after all the publicity with regards this type of theft people fall for it every day. These acts are theft , and only become a robbery if an act of violence is used to effect that theft. If you are worried always drive to the nearest service area just in case your back wheel is loose. Remember do not all pile out of the car to look   :-[

So here is a little clip from Dave (In his M&S loafers) and the UK Gov.  8-)

https://www.gov.uk/government/world-location-news/holidaymakers-warned-to-watch-out-for-highway-robbers-in-spain