When the speed limit on Mountain Road was cut to 35 mph

SPEED limits in the earliest decades of automobiles were often a tricky phenomenon to control. "Fast driving" was among the earliest of descriptions for speeding.
"Speed limit is cut to 35 miles on Mountain Road" was a June 27, 1925 headline in the Weekly Reflex newspaper of Kaysville-Bountiful. From the Weber River Bridge to North Farmington, the new speed limit was in effect to curb wild driving. The State of Utah had recently raised the speed limit from 45 to 50 mph, but that speed was too high for canyon roads, with curves and dips.
Besides Mountain Road, another 21 canyons in Utah -- including Sardine Canyon, Weber Canyon, Ogden Canyon, Parley's Canyon and Provo Canyon were all slated to have lower speed limits to enhance safety.

                                    Highway 89, "Mountain Road," through Layton today.

-Before the freeway of the 1960s, Hill Field Road used to connect with Layton's Main Street further south than it does today. That old connection was basically through the Hill Villa subdivision and Hill Field Road. So, prior to I-15 altering Hill Field Road's path, it used to connect with Main Street at about 450 North, instead of today's 800 North. According to the Weekly Reflex newspaper of July 24, 1952, a traffic signal was finally installed at the junction of Hill Field Road and Main Street that summer. The City's first traffic jams took place in Hill Villa, when commuters from Hill Air Force Base left work in the afternoon.