The
A25 road is one of the two cross-sector non-motorway grade roads in the
2 sector (or Zone 2) of
Great Britain alongside the
A27 which is approximately double its length along the south coast. It carries traffic from
Guildford in
Surrey eastward through
Dorking along the southern edge of the
North Downs, i.e. the
Vale of Holmesdale, between that range and the
Greensand Ridge to reach mid-west
Kent.
En route, the road passes through
Reigate,
Redhill,
Nutfield,
Bletchingley,
Godstone,
Oxted,
Westerham,
Brasted,
Sevenoaks and
Borough Green. It passes over six of the seven rivers which drain the vale and land to the south, in separate
catchments. A short distance beyond Borough Green, at
Wrotham Heath,
Platt,
Kent the A25 ends at a junction with the
A20, which continues eastward towards Maidstone. It for a short distance continues beyond the traditional
Portsmouth Road which has since been replaced by a bypass which the road does not reach, and thus extends into Zone 3.