 A series of bridges and interchanges were built along the highway and every side road with an even number (4, 6, 8, 10, 12, 14) was cut off in West Gwillimbury at Highway 400.The remaining side roads, with odd numbers, were given access either over or under the highway.Highway 88 was given a clover leaf interchange where 8 ramps were constructed, which was one of the most expensive types of interchanges that could be built at the time.