At the Parkway the lighting columns appear then the road widens to three lanes, then at Acklam at the A1130 interchange it becomes four before two peel off for the A66 for Stockton-on-Tees and Middlesbrough. The Tees Bridge opened in 1975. Either side of the River Tees crossing, the Tees Viaduct, is a retail park - Teesside Park with a Morrisons to the south of the river and Portrack with an Asda on the Stockton side, with a mass of industry in the vicinity of the A66/A19 interchange. This interchange is one of the few 4-way free-flow interchanges in Britain not found on the motorway network, and is similar to a four-level stack interchange, but with a single loop ramp covering the A19 south to A66 west movement. This road was improved in 1998 by widening from 2 to 3 & 4 lanes each way the section between the Parkway and Norton. Even in rush hour the road still flows quite well. The grade-separated £19 million Billingham Diversion was officially opened in February 1983, which diverted the traffic through a sub-standard section with roundabouts (Wolviston By-pass) built in the late 1960s.