Would you remember to pay without Dartford toll booths?
Drivers could be fined more than £100 pounds if they use the Dartford crossing without paying.
A new system will replace the current tolls in 2014 to ease traffic jams. Barriers will be removed and cameras installed instead. Similar to the way the congestion charge works in London.
But some people are worried that without barriers, drivers will forget to pay. Andy Dickenson reports.