Six car repair firms in east Kent have been given prohibition notices after serious safety risks were found by inspectors.
Council health and safety officers in Canterbury, Dover, Thanet and Shepway inspected 53 premises in a week.
Canterbury City Council said six premises were given notices to ban the use of dangerous equipment or work methods that put safety at risk.
Ten businesses were told to make improvements to how they operated.
The council said standards varied considerably between premises, but some firms were performing well.
Mike Walters, principal inspector for the Health and Safety Executive in Kent, said it was clear that industry standards were falling "quite a long way short of the mark".
Inspections were carried out at vehicle repair firms, tyre and exhaust fitters, MOT stations and spray shops.
Safety hazards included failure to manage asbestos, uncontrolled or unmanned public access into workshops, unguarded mezzanine floors, and using unsafe portable electrical tools.