1, investigate the scene of the accident, and find out the accident vehicles, parties, roads and their spatial relations and the weather conditions at the time of the accident.

2. Fixing, extracting or preserving on-site evidence materials.

3, ask the parties and witnesses, and make the inquiry record.

4. Conduct other investigations. When investigating the scene of a road traffic accident, the traffic police shall, in accordance with the provisions of relevant laws and standards, take photos of the scene, draw a scene map, extract traces and material evidence, and make a record of on-site investigation.

In the event of a road traffic accident in which more than three people are killed, on-site camera shooting shall be conducted. The site map and the record of site investigation shall be signed by the traffic police, the parties concerned or the witnesses who participated in the investigation. If a party or witness refuses to sign or is unable to sign without a witness, it shall be recorded.

If traces or evidence may be lost due to time, place, weather and other reasons, the traffic police shall fix, extract or save them in time. If the driver of a vehicle is suspected of drinking alcohol or taking psychotropic drugs or narcotic drugs under state control, the traffic control department of the public security shall promptly draw blood or take urine samples in accordance with relevant regulations and send them to a qualified inspection agency for inspection.

If the driver of a motor vehicle dies on the spot, he shall have a blood test in time. The traffic police shall examine the identity documents, motor vehicle driving licenses, motor vehicle driving licenses and insurance signs of the parties concerned. Traffic accident suspects can be summoned according to law.

Second, the traffic accident investigative steps

After receiving the report, the public security traffic management department shall make a good record of the report.

According to the general understanding, if it is a major or extraordinarily serious traffic accident, it should be reported to the superior public security traffic management department or relevant departments in time. If it is not under its jurisdiction, it shall transfer the case to the competent department and notify the relevant parties who reported the case in time.

After on-the-spot investigation, if it is a traffic accident, it shall fill in the Traffic Accident Registration Form. A case that does not belong to a traffic accident shall be notified to the parties in writing with the approval of the person in charge.

The on-site investigators of the above accidents shall generally not be less than two. In the event of major and extraordinarily serious traffic accidents, the regional and municipal public security traffic management departments shall send personnel to the site to guide the exploration, and invite people's procuratorates to send personnel to the site for exploration when necessary.

The public security traffic management departments of provinces, autonomous regions and municipalities directly under the Central Government may also send personnel to the site to guide the exploration when necessary. The work of maintaining order at the scene shall be carried out by the public security traffic management department of the management place. After the investigators arrive at the scene, they should first rescue the injured and property immediately; Then collect physical evidence, find witnesses who witnessed the accident and make exploration materials; Finally, check the items left over from the site, do a good job of cleaning and evacuation, and restore normal road traffic. The traffic accident scene map drawn must be signed or sealed by the inspector and cartographer, and the parties at the scene should also sign, and the witnesses who are not at the scene or cannot sign should sign and seal. If the parties refuse to sign and there are no witnesses, they shall truthfully record the situation.

The public security traffic management department shall protect the items left at the scene except the physical evidence and return them to the parties in time. If the owner cannot be found, the temporarily unclaimed articles shall be properly kept.