Over 85% of UK motor fleets are not carrying out even basis risk management, according to Norwich Union (NU).
A survey of 12,000 of the insurer's fleet policyholders showed that only 15% are implementing a programme of fundamental risk management measures. These include driving licence checks, issuing driver handbooks, investigating accidents and pre-employment checks of driver competency and experience.
The situation is particularly bad among small fleet operators.
NU head of motor underwriting Kevin Edwards said: "Small operators fail to understand their liability for the safety of their drivers and potential cost benefits of implementing basic measures."
NU is planning an initiative to give all its fleet customers access to practical risk management advice.