Two appliances and crews from Aylesbury attended.
A lorry was on its side following a collision with a bridge. The driver was out when they arrived. The firefighters provided immediate emergency care and made the scene safe. They used absorbent pads to mop up diesel spilt from the lorry.
The driver was passed into the care of South Central Ambulance Service.
The road was closed while the emergency services were on the scene.
The incident was left in the hands of Thames Valley Police.