Welsh workers are more reliant than the English when it comes to getting to work in a car or van.
New figures by the RAC Foundation show people are buying and running cars they can't afford in order to get to the office.
In Blaenau Gwent more than 82% of employees depend on a vehicle to get to work, followed by Neath Port Talbot and Torfaen.
The RAC Foundation also says some people are even put off from taking up a job because they just can't afford the commute.
The Welsh Government says it's aiming to create an accessible and affordable transport system that offers a viable alternative to the car.
Megan Boot reports.
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More than a thousand riders will be taking part in a series of events in and around the town.
Some warm spells of sunshine will develop, although scattered heavy and thundery showers are also expected during the afternoon.
A yellow 'be aware' warning has been issued by the Met Office for much of Wales.