Oh yes you do. All it takes is falling awkwardly and hitting your head against the curb. Poof. Gone.Man i hope there is special more relaxed rule for riding bike at low speed. I ride bike to buy bread, to buy canned cat food, to atm, going at bicycle speed 30 40 kmh, i really dont need helmet from falling at those speed, if the accident involving another vehicle then helmet surely wont matter.