The scheme was predicted to cause a direct reduction in traffic on the busy parallel A14 road of 5.6% (rising to 11.1% with the new Park & Ride sites), although as other traffic re-routes to the freed-up road space from other parts of the local road network, the net reduction is predicted to be 2.3%. The overall scheme was "not intended to solve the congestion problems on the A14" by itself, but will rather have an overall effect across the local road network, and be complementary to planned improvements on the A14.