A21 road, trunk road in Southern England
The A21 is a road in southern England running about 58 miles from London to Hastings, connecting several towns and villages along its route. It passes through mixed urban and rural landscapes, with some sections built as dual carriageways while others remain single-lane and winding through countryside.
The A21 follows many historic turnpike routes established hundreds of years ago, particularly the section from Sevenoaks to Tunbridge Wells dating to the early 1700s. Major 20th-century transformations included the Sevenoaks bypass completed in the late 1960s and the Tonbridge bypass in the early 1970s, which redirected traffic and reduced travel times.
Travel outside rush hours for a smoother journey, as weekdays and holiday periods can bring heavy traffic that slows progress considerably. Be prepared for winding sections and narrower lanes through villages, especially approaching Hastings town center where pedestrian zones require traffic diversions.
Near Lamberhurst village, the A21 crosses one of Britain's first wildlife bridges, designed to help animals safely cross the road and avoid traffic hazards. The bridge includes planted vegetation on one side to create a natural passage for local animals.
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