Bike lanes work better without cars, signposts or scaffolding parked in the middle of them. Here are some of the worst examples submitted by Guardian readers from around the world

Valencia, Spain

Marseille, France

Carpark? No, bicycle path Marseille is discovering bicycle paths, but it is a painful beginning.

London, England

London Cycle Superhighway 2 So this is what all this blue paint is for...

North of Warsaw, Poland

Because it's cool to have bike paths... Who cares if the bike path is useless? At least they can say that they have a whole 50m of bike bath! (Yes, what you can see is all there is to it.)

Sitia, Crete

The cycle path no-one wanted. Crisis-stricken Greece. A 3 million euro cycle path coming from nowhere and going nowhere planned by someone in a far away office by drawing a random line on a map. Simply to take up certain EU funds. Work was halted three months ago because no-one has been paid.

Madrid, Spain

It s made for you to train trial not to have safe ridei In Alcalá de Henares (Madrid, Spain) our authorities have spent a lot of money "building" a non sense "cycling lane"

Belfast, Northern Ireland

The Spider's Web Believe it or not, this is a route into Belfast which forms part of the National Cycle Network

Brisbane, Australia

Brussels, Belgium

And finally, here's an example of cycling activists taking matters in to their own hands.

Before Cyclo Guerilla Cyclo Guerilla is tired of waiting for safe bike paths in Brussels. So they do it themselves...

AFTER CYCLO GUERILLA INTERVENTION Cyclo Guerilla is tired of waiting for safe bike paths in Brussels. So they do it themselves... https://www.facebook.com/cyclo.guerilla.bxl

Thanks for all your contributions. Next time we'll round up your more positive examples of cycle paths in cities around the world.