Cyclists need to make sure they are well lit through the winter months, says the Cycling Action Network.
"The onset of shorter days means it's time for cyclists to check their lights and batteries," says CAN spokesperson Patrick Morgan.
"Lights, reflectors and high-visibility riding gear make you easier to see."
"Cycling offers the ultimate trip: it's a fast and convenient way to get around, while improving your health at the same time."
"Our message to people is to get out there and enjoy the ride, and to remember to use lights whenever visibility is poor."
Mr Morgan also has advice for drivers. "At this time of year look out for the lights of people on bikes. Give them plenty of room when overtaking, as required by the road code. A clearance of a metre and a half is recommended."
- use lights between sunset and sunrise.
- have one or two front lights on your bike. One front light may flash. Front lights must be white or yellow.
- have at least one red rear light. Rear lights may flash.
Lights must be seen from 200 metres away at night.
Lights must not dazzle, confuse or distract other people.
Bikes and cyclists out at night must have a red rear reflector on the bike, and reflectors on pedals, or reflective clothing.