All visitors to the site must wear safety helmet.
到工地的所有参观者必须带上安全帽。
All participants must wear a safety helmet or bike helmet during the race.
所有参赛者必须佩戴安全帽或单车头盔进行比赛。
All the competitors must supply their own safety equipment and must wear a helmet. Gas and electric powered bikes are not permitted.
参赛者自备参赛车辆、装备与护具，所有车辆不得配有任何非人力传动、助动装置。
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