CHP begins maximum enforcement period ahead of Fourth of July weekend All the CHP's available officers will be on the road for the holiday weekend to watch out for distracted drivers, speeding or driving under the influence. Author: Joseph Daniels (ABC10) Updated: 8:49 PM PDT July 3, 2021 CALIFORNIA, USA — The California Highway Patrol will begin its Maximum Enforcement period started on Friday that will last until July 5. All the CHP's available officers will be on the road to watch out for distracted drivers, speeding or driving under the influence. They are also be looking out for signs of road rage as well.