... ,a good helper of the manager,mainly used for city intersection,highroad crossing,toll gate,garden,village, ... be installed on the surface of asphalt roads and concrete roads.2) To improve life span ,the road ... bump to the surface of the road 3) For A type road bumps,use a ateel bar or ... the customer can easily purchase on local market);fixer for concrete roads:bolt(standard parts, the customer can easily ...