It is advisable not to move a vehicle after a crash. But, if it's causing a roadblock, make sure to take photographic evidence before moving the car, if it is safe to do so. Moving the car might prevent accurate assessment of fault. You need to check, however, if traffic is completely stopped and it is safe to exit the vehicle to take photographs before moving the vehicle to the shoulder. You should not exit the vehicle if it is not safe to do so.