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Road users are advised to follow the hollow diamond signage.

M4 westbound traffic:

At junction 3 exit the M4 and take the 3rd exit onto the A312 ‘The Parkway’.
Continue following the A312 ‘The Parkway’ through three roundabouts for approx. 4.1 miles.
At the fourth roundabout take the second exit and continue on the A312 ‘Church Road’.
At the next roundabout take the 1st exit and join the A40 westbound.
Continue on the A40 as it merges into the M40
At J1A exit the M40 to access the M25 anti-clockwise J16 to J15.
Follow the M25 anti-clockwise to J15 and exit at J15 to access J4B M4.