Change Route: M4 (Both directions)

The biggest single motorway contract ever let; the final bill for the intersection accounted for £44m out of the £69.8m for J14 to J16. Leave here for Slough, Reading, London West, and "THE WEST". Watford & M1 signed ahead. The next section to J16 had to pass over an asbestos tip and a structural platform had to be provided.