Public liability insurance holders have been told about the need to carry out risk assessments after a council was prosecuted.
Argyll and Bute Council pleaded guilty to breaching Section 3(1) of the Health and Safety at Work Act 1974 and was fined £20,000.
It came after Duncan MacGillivray, 75, of Dunoon, drowned after accidentally putting his car into forward gear rather than reverse and driving off the unprotected edge of a car park situated on a pier.
An earlier hearing, Dunoon Sheriff Court heard that neither prior to the pier being used as a council-operated car park or after it was brought into use was an assessment of risk to those using the car park carried out.
Mike Orr, Health and Safety Executive (HSE) inspector, said: "A simple risk assessment would have identified the clear risks of an unprotected sheer drop into the sea at the edge of a car park – but sadly the council failed to do this."
Last month, the benefits of risk assessments was brought up by HSE inspector Cain Mitchell, following the prosecution of Conder Solutions.