Together with parts of the M3 and the M40, the A34 forms an important route carrying freight from Southampton to the Midlands. Because of the volume of traffic, bypasses were built along this route – at Newbury on the A34, and at Twyford Down near Winchester on the M3 – but these were controversial for environmental reasons. Notably instead of cutting a short road tunnel through Twyford Down, the escarpment was carved out for the road traffic of the motorway, though the route of the old A33 closed as a result.