Transportation Secretary Sean Duffy fired off a letter Tuesday to the governors of all 50 states, urging them to promote public safety by removing any politically charged and distracting displays from public roads,

In a letter to all 50 state governors, Washington, D.C. Mayor Muriel Bowser, and the governor of Puerto Rico, Duffy — a former Republican congressman — urged them to take part in the Federal Highway Administration’s “Safe Arterials for Everyone through Reliable Operations and Distraction-Reducing Strategies,” or SAFE ROADS, initiative.

U.S. Transportation Secretary Sean Duffy urges state governors to focus on improving road safety, particularly on non-freeway arterial roads.

The US Department of Transportation wants to make it easier for automakers and tech companies to deploy self-driving cars without traditional controls like steering wheels and pedals. In a letter sent to stakeholders,