Four drivers have been charged following separate traffic incidents investigated by the Upper Ottawa Valley OPP in recent days. On Aug. 10, shortly after 4 a.m., police received reports that a tractor-trailer had entered the ditch on Highway 17 east of Deep River in Laurentian Hills Township. No injuries were reported. The tractor-trailer driver from Brampton, was charged under the Highway Traffic Act with careless driving. Highway 17 was closed…