may not have been present during the entire time [the witness] observed [defendant] driving, we note that a motorist may be stopped for reckless driving even if the only concern is for the motorist’s own safely.” Id. at 608 (citing Commonwealth v. Masters, 737 A.2d 1229, 1232 (Pa. Super. 1999), appeal denied, 562 Pa. 667, 753 A.2d 816 (2000)); see also, Commonwealth v. Cook, 865 A.2d 869 (Pa. Super. 2004) (finding that a report of erratic driving followed by a trooper’s independent observations of the defendant’s vehicle crossing the right white fog line three times, to the extent of half the vehicle width, over a distance of one mile, each time rapidly jerking the vehicle back into its lane of traffic, justified the traffic stop); Commonwealth v. Klopp, 863 A.2d 1211 (Pa. Super. 2004) (<HOLDING>). In summarizing whether a police officer has
holding officers observations of a vehicle crossing the center double yellow line of a twolane highway four times by less than one half of her car  once causing a vehicle in the oncoming lane of traffic to shift right within his lane but without the need for drastic evasive action  and crossing the fog line four times over a distance of at least 16 miles established probable cause for a traffic stop holding that an officers observations of a vehicle weaving between the center line and the shoulder line four to five times over a distance of approximately five miles created reasonable suspicion that the driver was under the influence holding that an isolated incident of a vehicle crossing into the emergency lane of a roadway does not violate state statutes requirement that vehicles remain entirely in a single lane as nearly as practical holding that the officer acted within the scope of his authority in requiring the defendant stopped in middle lane of traffic to exit his vehicle holding officer had a reasonable basis to stop a motorist for crossing the fog line and that failure to have regard for the width and use of the street by swerving off the side of the road or crossing the marker lines constitutes probable cause for a traffic stop