C-GVXW, a privately operated Bushby Mustang II aircraft, was conducting a flight from Abbotsford, BC (CYXX) to Merritt, BC (CAD5). During the flight at 7500 feet, the pilot received a carbon monoxide warning and noticed exhaust fumes in the cockpit. After declaring a Mayday, the pilot decided to make an emergency landing on Highway 5, approximately 12 nm South of CAD5. The pilot landed the aircraft on the Highway and taxied the aircraft to the center median without further incident. The wings were removed and the aircraft was transported to CYXX on a trailer.
Subsequent maintenance inspection revealed a crack on the exhaust pipe.