More than 13 years' worth of data covering hundreds of companies has shown the biggest risk of an accident comes when parking or manoeuvring.
Peak Performance Management, which carried out the research, warns that even low speed accidents can have serious consequences. Slow speed carelessness tops a list of the 10 most frequent faults affecting fleet car drivers.
The second most common is driving too close to the vehicle in front, raising the potential for a rear-end collision. This can be avoided by applying the 'two second rule' – leaving a gap of at least two seconds between you and the car in front.
The third fault involved stopping too close to the vehicle in front, raising the risk that if someone hits your from behind, your vehicle will crash into the one in front.
The fourth biggest fault is speeding, followed by driving while tired and falling asleep at the wheel. Sixth is driving in a vehicle's blind spot, so if it turns you can't be seen, while braking too late is the seventh danger.
A spokesman for the firm said: 'Eighth is a lack of hazard awareness by company drivers, often resulting in harsh braking and front or rear end accident potential.
Always try to remember, the more money spent on the road in terms of paint, signs, surfacing and other 'road furniture', the greater the hazard and risk of danger.'
The ninth biggest problem is not allowing for different types of drivers, from HGVs to despatch riders, who have different time constraints and driving styles. The tenth problem is poor positioning on the road.
James Sutherland, the firm's managing director said: 'These are the most common ten driving faults on our roads – but with them all, there is an answer, and driving risk reduction training can provide that answer.'
Top 10 driving faults:
Source: Peak Performance Management