 Highway 16 was redesignated to follow Stony Plain Road, 170 Street, and Yellowhead Trail through Edmonton.By 1988, Highway 16X was twinned and transitioned to being the preferred western entrance into Edmonton, while the Stony Plain Road section of Highway 16 was more focused on commuter traffic.In 1990, in conjunction with Highway 16 assuming the Trans-Canada Highway route shield, Highway 16X also assumed the shield, an exception to the general practice in Alberta where suffixed routes are signed only with a standard Alberta highway shield.