In this paper. we address the problem of planning police patrol routes to regularly cover street segments of high crime density (hotspots) with limited police forces. A good patrolling strategy is required to minimise the average time lag between two consecutive visits to hotspots. as well as coordinating multiple patrollers and imparting unpredictability in patrol routes. https://www.chiggate.com/3m-speedglas-9002nc-welding-helmet-fashion/