Scots commuters have been urged to swap their cars for bikes as part of a national campaign to unclog the country's streets.
Only 2% of journeys are made by bike in Scotland
Cycling Scotland, the body set up to promoting cycling's role in transport, said immediate action was needed to cut the number of journeys made by car.
More than 160 events will take place throughout Scotland over the next seven days as part of the UK-wide Bike Week.
Cycling Scotland hopes it will provide "the catalyst for real change".
The Scottish Executive-funded organisation said Bike Week provided an important opportunity to cut congestion in Scotland's towns and cities.
About 2% of journeys in Scotland are made by bike, while some European countries report figures above 20%.
More than 60% of car journeys in Scotland involve a distance of less than two miles.
This year the national initiative includes the Bike 2 Work campaign, under which councils and companies are being urged to encourage their employees to adopt pedal power.
Erl Wilkie, the chief executive of Cycling Scotland, said: "As a nation we have a strong cycling heritage.
"Throughout our time as an industrial nation thousands of Scots cycled to work and study.
"There is every reason to support a return to widespread cycle use, not least because without immediate action the car usage will cease to be viable in short, congested routes."
He acknowledged that cycling was not the right choice for every person or every journey.
"But by thinking about what trips we could cycle in preference to driving we can all play a part in making Scotland a better place to live and work as well as ultimately avoiding gridlock," he said.