In a civilised country they may also have deployed a paramedic on a high powered motorbike to attend the scene and provide initial care. Unfortunately this is Thailand where even the emergency lane on the highway is considered an overtaking lane and it's use is actively encouraged by the boys in brown waving their batons when traffic is heavy. Numerous times I've witnessed ambulances being blocked in this way on the freeways around Bangkok and Samut Prakan, yet to see any ambulances drivers complain.