According to the CHP, the incident occurred about 11:15 a.m. on Interstate 8's westbound lanes near Second Street in El Cajon. After the aircraft experienced engine trouble, the instructor took over the controls of the Piper propeller aircraft and landed safely.
No one was injured and no vehicles were struck.
The plane, which was pushed to the right shoulder after landing, appeared to be intact.
Two lanes were shut down as an investigation got underway at the scene.