London is easily accessible by a number of major motorways. The M25 runs around the city itself and connects with the M1, M11, M10, M4, M3 and M40.
For more details try the AA Route Planner
There are both short stay and long stay Airport Parking faciliies at London City Airport . There is also a drop-off area located a short walk from the terminal building.
The long stay car park is suitable for those who wish to leave their car
for longer than a week.