It is possible for the travellers to enter Iran through Bazargan border by their private vehicle.

For doing such a thing, the travellers require to take passing card from the Automible club in their country.

The following documents are necessary for entring Iran by private vehicle:

1. Liability Insurance

2. international driver's licence (having enough validity)

3. International automobile card

Although the passing card you have taken from the automobile club in your country has 1 year validity,  according to Iran's law it has just 3 month validity, so if you desire to stay in Iran more than 3 month, you have to pay some money and extend it in Iran.