Sussex Police’s chief constable has urged people to take more care on roads.
Chief Constable Giles York called on motorists, cyclists and pedestrians to think more about road-safety following a rise in the number of fatalities or serious injuries.
A spokesman for Sussex Police said more people had died or been seriously injured on Sussex roads in the first 11 months of 2014 than in any of the previous six years.
The total was 927 and seven people have died on the roads in December.
Mr York said: “Collisions are not just happening because of bad weather, as the weather hasn’t been particularly bad. It isn’t that the roads are bad. It is simply that many people are behaving like idiots by driving dangerously and thinking that it won’t happen to them.
“Too many families in Sussex are spending this Christmas mourning family and friends who have been killed on the roads of Sussex this year, or will spend it in hospital with loved ones because of the selfish actions of others.
“Please take care on the roads and make sure you - and everyone you meet - gets where you want to go safely.”
Motorists were encouraged to check their vehicles are roadworthy before they start journeys, urged to reduce their speed, increase their stopping distances and to be alert for how other road users are being affected by the conditions.
Cyclists were encouraged to make sure they can see and be seen on the roads, check their bikes are in a good condition and be aware of other road users.
Pedestrians were asked to take extra care on slippery pavements and when they are crossing the road, including giving vehicles extra time to stop.