A student leaving Greenspun Junior High School in Henderson enters a car in the travel lane of Valle Verde Drive on Sept. 14, 2022. He also pointed to research showing a reduction in teen driver motor vehicle crashes when high school start times are pushed later in the morning. School zone safety changesDrivers also can expect to find refreshed traffic infrastructure near schools and harsher penalties for school zone traffic infractions, according to Andrew Bennett, director of the Clark County Office of Traffic Safety. These changes, and roughly 70 others, were recommended by a working group aimed at improving school zone traffic safety. The city of Las Vegas also expanded its crossing guard coverage to five additional high schools within city limits.