An early morning collision in Thermal is blocking traffic. Drivers may want to avoid Harrison and Middleton Streets. That’s where a vehicle has collided with a semi-trailer truck carrying lumber around 4:30 a.m. Thursday. The California Highway Patrol says one person was trapped for a short time but the driver of the semi-trailer truck pulled the other motorist out from under his truck. The driver of the vehicle suffered minor injuries. There was a diesel spill and hazmat crews will be on scene for several hours.