In the distant future people no longer drive cars themselves, instead relying on AI (artificial intelligence) computers to drive their cars for them. But when these AI systems start losing control and running wild somebody has to stop them. éX-Drivers are the people who are able to operate the older mechanical non-AI dependent cars who chase down the AI cars and stop them.
A good amount of future or near future technology was featured throughout the series, including automated highway systems and A.I. (Artificial Intelligence) technology. Automated highway systems have been proposed as a solution to the traffic congestion problems.
Anybody regardless of age can be an éX-Driver as long as they possess the required skills. This would explain why one of the main characters can be only 13 years old and drive. The premise of the show is that there are éX-Drivers all over the world but the focus is on the team operating in Japan.
Cars used by éX-Drivers are marked with an éX-D decal. Typically an éX-Driver car would be an older mechanical type car and almost always would be rear-wheel drive with the exception of an AWD (4WD) Subaru Impreza WRC since éX-Drivers usually employ techniques such as drifting when bringing down runaway cars, which is much more difficult with front wheel drive (FWD) cars and in an all wheel drive (AWD) car.