Forty-four per cent of UK drivers convicted for killing cyclists go to jail, BBC Radio 1 Newsbeat has found.
Figures from all 45 police forces in the UK show that more than a quarter of those found guilty over cyclist deaths did not receive driving bans.
The statistics for 2013 show that 109 cyclists were killed on UK roads and more than 3,000 were seriously injured.
British Cycling and campaigners say drivers are being let off too lightly and want tougher penalties.
Newsbeat obtained information from a Freedom of Information request to the UK's 45 police forces.
The figures show that in the last seven years 148 people were charged with killing a cyclist.
Of those found guilty, 44% went to prison.
The average jail sentence was less than two years, while the average length of driving ban was 22 months. For 26% of drivers, no ban was imposed.
The average overall figure in England and Wales for those imprisoned for causing a death on the road, including pedestrians and other drivers, is about 60%.
George Holland, who lost his father three years ago when he was hit by a car on a country road, thinks his family has not received justice after the driver at fault got 200 hours community service, an £80 fine and an 18-month driving ban.
"[The driver] drove straight into the back of him and snapped his neck and he died instantly," he said.
He thinks that better cycle lanes would make a big difference, but nothing will bring back his father.
"To our family it wouldn't have made us feel any better if the driver was thrown in prison.
"If he'd got two years it wouldn't have made me feel better. A lifetime ban would probably be a just sentence."
Pro-cycling group and the sport's governing body, British Cycling, says it wants tougher bans and longer prison sentences, especially for repeat or serious offenders.
"Our legal system doesn't support fully enough the more vulnerable road user and it doesn't reflect the responsibility people have when they drive a car," said ex-Olympic cyclist Chris Boardman, a policy adviser for British Cycling.
"If you seriously injure someone or behave badly on the roads then I think we should see an awful lot more licences taken away, and I think that would very quickly improve behaviour."
Bart Chan, 27, who was run over by a lorry in London, said: "It devastated me because I don't want other people to go through it or die under lorries.
"Policy-makers need to show that with penalties and enforcement they're taking it a lot more seriously. Especially if people are using mobiles at the wheel or on drink or drugs."
Driving groups think it is wrong to demonise one type of road user and that it is impossible to increase penalties just for cyclists.
A spokeswoman for the AA, Lorna Lee, said: "The courts already have a wide range of sentences that they can give to drivers who kill cyclists, whether it's through careless or dangerous driving.
"The judge will look at all the different circumstances in that case before deciding what sentence to give."
The maximum sentence for death by dangerous driving is 14 years and five years for death by careless driving.
A 26-year-old who is being taken to court for knocking down a cyclist and who cannot be named for legal reasons, said it was wrong to penalise those who kill or injure a cyclist in what could be seen as unfortunate accidents.
"I don't think it's fair because I wasn't driving dangerously, I wasn't driving erratically," he said. "I just failed to see someone who was on the road."
Meanwhile, a group of MPs is calling for a cycling budget of £10 per person by 2020 to improve road safety.
The Transport Select Committee says spending is currently estimated at £2 per head.
"Cyclists have told us the dangers they face every day from a lack of cycling infrastructure, poorly-designed junctions and aggressive driving," said committee chair Louise Ellman.
"Investing in cycling will make the roads safer for all users and encourage more people to cycle and walk."
The Freedom of Information figures in full
(Newsbeat obtained information from 45 police forces - 32 gave us useable statistics)
- Between 2007 and 2014 there were 276 recorded incidents where a cyclist was killed in an accident involving a motor vehicle.
- Of these 276 incidents, 148 resulted in the driver of the vehicle being charged with an offence - that's 54%.
- Of the 148 charged there were 108 convictions - 73%.
- Of the 108 convicted, 47 received a prison sentence - that's 44%.
- The average length of imprisonment was just under two years.
- Of those convicted, the total number disqualified from driving for a specified period is 80 - that's 74%. Therefore roughly three-quarters of all those convicted were disqualified for a specified period.
- Just over a quarter of those convicted for killing a cyclist didn't get a driving ban at all.
- The average length of disqualification was 22 months, just under two years.