If you have an Up-and-Over type or a roller door these are generally fine for any sloping drives. You can have these both electrically or manually operated. A further option it to have a small door fitted into the larger door of the garage for single person access.
Personally I'd thumb through Yellow Pages and get some local garage door suppliers to come and have a look at it, make recommendations and give you quotes. Then you can compare their suggestions and make a decision about what you want to do.
===========
commercial roller door repair