The full relevant book was: "A guide for highway traffic regulation in an emergency". https://babel.hathitrust.org/cgi/pt?id=ien.35556021306899&seq=1 https://ba

The full relevant book was: "A guide for highway traffic regulation in an emergency". https://babel.hathitrust.org/cgi/pt?id=ien.35556021306899&seq=1 https://babel.hathitrust.org/cgi/pt?id=ien.35556021306899&se... The Maintain Top Safe Speed thing was envisioned for transiting across fallout-contaminated areas in the weeks and months afterwards. It prescribes there would be cops stationed at the ends of such routes, limiting the flow of cars entering so that those within the stretch would not be congested and could go fast.