David Engwicht, an artist and social innovator, draws on elements of wicked delight – intrigue and uncertainty – in his work on traffic. In Mental Speed Bumps: The Smarter Way to Tame Traffic (Envirobook, 2005),he argues for the removal of road markings, lines and signs, an approach at odds with traditional traffic-engineering solutions. Engwicht works on the assumption that speed signs, road bumps and other on-road instructions and intrusions leave the motorist feeling secure and certain about the conditions he or she will encounter. By removing these clues, the driver is required to learn to expect the unexpected and to slow down. And to further encourage an appreciation and awareness that something surprising may happen, Engwicht asks people to gather in the streets: on their doorsteps, in the front garden, on the footpath. Participants find themselves engaged in unusual activities such as eating breakfast in the front yard, putting up decorations or creating a temporary living room in a car space.