The Transport Department on Thursday impounded four autorickshaws that had fake number plates.
The vehicles were using numbers allotted to motorcycles and cars. Officials cross-checked the numbers with a list of autorickshaw numbers they carried, and found that the numbers were missing, an official said.
The official said the drive would continue till all autos using fake plates are impounded. They had so far seized over 30 autorickshaws plying without permits.