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Err... I was wrong. "Уезжать" can be single-action as well as multi-action.
single-action:

ехать, уезжать, ...

Я еду в Рим. - I am going to Rome (right now). I go to Rome (right now).

Я...

There is no verb "езжать".

There are:
1)imperfective verb "ехать"
2)a number of perfective verbs "preposition+ехать" like уехать, приехать, доехать etc. etc.
3)a number of imperfective verbs...