sentences:  On November 30, 1990, the Northfield Drive interchange was fully opened to traffic, eliminating a traffic signal from the northern end of the Conestoga Parkway.The speed limit on the parkway was lowered from to on January 10, 1994 following numerous cross-median collisions.In 1998, during the mass downloading of provincial highways to lower levels of government, the majority of Highway 86, from the Northfield Drive interchange to Amberley, was decommissioned.