"Patrol" is a word that means to regularly or routinely go around an area or location to keep an eye out for any problems, dangers, or suspicious activities. Full definition
Police on patrol in three German airports have launched investigations into 20 families who pulled their children out of school to go on vacation. (npr.org)
More police are needed on patrol with more powers to act. (conservativehome.com)
But something else also happened in the»90s: video cameras were installed in thousands of patrol cars all across the country. (educationnext.org)