Holidaymakers could be left stranded at the airport as a Europe-wide shortage of hire cars hits travellers.
Bigger bills are also facing those who manage to find a car, because a shortage of supply has resulted in the price of hire cars doubling in some places.
Fleets cut due to dire forecasts
Predictions that recession-hit travellers would stay at home meant that hire firms have cut their fleets, and had difficulty obtaining finance to replace old vehicles.
A rush in last-minute bookings has confounded the forecasts and left many destinations without any hire cars.
Spain is the worst-affected area, with those who can get a car having to pay double the usual rate.
With small cars in particular demand, hiring a larger vehicle can often prove to be cheaper.
President of Hertz Europe, Michel Tirade, said: 'There's a seasonal shortage of rental cars every summer, but it seems to be more acute this year because carmakers have cut production due to the uncertain economy.
'There has been a big increase in domestic and US inbound travel, and holidaymakers are deciding to go away at the last minute.'
Our reviews are based on hard data and thorough testing in the real world.
Up to the minute news from around the globe