corridor

A corridor is defined less by its length than by its gaps. A motorway with a fast charger every sixty kilometres is a corridor. The same motorway with one gap of two hundred is a gamble.

1. Chargers close enough together that one broken site is not a crisis:
   1. no gap longer than a third of a typical car’s range,
   2. at least two operators along the way.
2. Sites large enough that the evening peak does not form a queue.
3. Information good enough that the driver never has to check.

The third is the cheapest to build and the one most often missing.

A corridor succeeds when the driver stops planning for it. Nobody plans the petrol stations on a motorway; they know there will be one. Charging becomes ordinary on the day drivers know the same, without looking. See range.