You can expect serious traffic congestion during most rush hours in and around Dorking Town Centre and in particular in the narrow one way system entering Dorking from the A25 from Guildford and Westcott, it is easily understood as most routes of road and rail converge at the town. The main A24 which runs North/South is very busy in the rush hours also. This causes congestion to traffic leaving Dorking heading to Rigate for access to the M25 heading East. If you want to go west then the M25 at Leatherhead (follow the A24 North) is the best route to take. Otherwise much of the Move valley Borough is relatively free from road delays owing to the moderate population in the wider area.  However, villages on main roads such as Westcott, Holmwood North and South, Fetcham and Bookham will suffer from a noticeable increase in traffic during rush hours as they lie close to the main road through roads.

Rail ~ north/south and east/west choice 
Key: Train lines shown as a black line with red squares as stations.
As can be seen from the map above Mole Valley is well served by the rail network.   Dorking has a regular service to London and also to destinations in the South. Leatherhead is fortunate because trains from Guildford and Dorking pass through Leatherhead heading for both Victoria and Waterloo. Visit www.railtrack.co.uk for further information.  Most stations have car parks adjacent to them, but these can fill quickly and are generally expensive.  

Air ~ both London airports nearby
Mole Valley has easy access to the M25 and therefore is in easy reach of Heathrow. An good estimate of average time from Dorking to Heathrow is 60-90 minutes. Mind you the M25 is renowned for making airport journey times much much longer so if you are heading to Heathrow you would be wise to allow twice that amount.  Gatwick airport is a much more leisurely drive, if you want to brave the M25 you can head East to Reigate and join the M23. It is a longer route and will burn more petrol but it is only one junction on the M25 so that is good. That said if the level crossing gates are down in Reigate then that will be an unwelcome delay. Alternatively heading south on the A217 (out of Reigate) or even through the country lanes via Charlwood is a pleasant drive in the Spring, Autumn and Summer months but you would be wise to avoid this route on icy snowy days as the roads are not cleared as well as the main roads. Without traffic delays you can get to Gatwick from Dorking in about 45-50 minutes but as always allow more time for unexpected problems. See www.heathrow.co.uk and www.gatwickairport.co.uk  for more information.