The California Highway Patrol is investigating a traffic accident that occurred at about 9:15 Tuesday morning.

The accident involved a vehicle running off the roadway and plunging down a 50 foot rocky ravine. The accident happened on eastbound Interstate 8 near the truck escape ramp on Mt. Springs Grade. One person sustained injuries in the accident. The roadway was partially blocked for a time for responding emergency crews to access the vehicle. The accident remains under investigation.