Whether we use cars or public transport to get around, we are bombarded with signs telling us what we must and must not to. Some people have decided to fight back. By Matthew Moore 1) Gatwick Express or drugged sloths? It's a close call. Spotted in March this year and posted on the Going Underground blog. 2) Dozens of surreal and humorous road signs were attached to lamp posts around the French city of Lyon for an art festival in 2004. The project spread to other cities, and was reprised last year as part of Lyon's unsuccessful bid to be named European Capital of Culture in 2013. 3) Hackers in the US figured out how to commandeer electronic road signs, leading to a spate of apocalyptic alert messages. Other versions included "RAPTORS AHEAD" and "NAZI ZOMBIES! RUN!!!". 4) A convincing spoof notice that will raise a smile from anyone who has travelled on the New York underground. Or the London Underground, for that matter. Spotted earlier this year and posted by Tumblr user heathalouise. 5) Posted on the side of a pedestrian crossing in New Haven, Connecticut by Ryan Laughlin, a blogger and web designer. 6) Optical illusion signs, which gave clear directions to drivers in particular lanes while appearing abstract and unreadable to other car users, were installed in the 92-floor Eureka Tower in Melbourne, Australia. 7) One of a series of fake stickers that appeared on Tube trains in 2004. Others included "No talking", "No eye contact" and "No busking". Via the Going Underground blog. 8) A selection of the guerrilla signs erected in Leeds by Final Frontier Design. 9) Class-conscious directions for people alighting at Piccadilly Circus Tube station. Part of a project by London-based artist Nils Norman, who specialises in finding ways to subvert urban life. Photo from the We love nice things blog. 10) Road signs warning of natural and curious phenomena - including fairies, "blobs", and the semicolon - appeared in Exeter in Summer 2000. Here the perpetrators explain the idea and describe the reaction of local people. 11) Positive parking signs from Reno City, Nevada. They were devised by viral marketing agency The Glenn Group, as an antidote to the gruff tone of most public signs. 12) Stills from a fun animation by Urban Chaos, an art group that specialises in imaginative road sign mash-ups. 13) A fitting home for one of the range of spoof stickers sold by "culture jamming" website mixthemessage.com 14) Canadian artist Lauren Marsden made knitted covers for every street she had ever lived on in Victoria, British Columbia. 15) Commuters using Oval Tube station in south London are treated to a thought of the day, courtesy of a playful member of staff. Pictures from Maggie Jones and Katy Lindeman on Flickr. http://www.telegraph.co.uk/motoring/news/6240537/Guerrilla-signs-15-funny-roa...