Zhengzhou Hengliang Tech Co., Ltd. hengliang_electronic@aliyun.com 86-180-39541010
Prioritize locations on major freight routes with steady traffic flow and convenient law enforcement access: National/provincial trunk highways, major county roads, expressway entrances/exits, provincial and municipal boundaries Approaches ahead of large bridges and long tunnels (for structural protection of bridges and tunnels). Locations to avoid: Urban downtown areas, sections with dense traffic signals, sharp curves and steep slopes. General principle: Vehicles shall pass through at a constant speed on a straight and smooth road without braking, accelerating or lane changing. Prohibited locations: Curves, ramps, overpass approaches and road diverging/merging sections. Within 35 meters ahead and behind the detection zone, the pavement roughness shall be within ±3 mm. No potholes, cracks or loose surface shall be present. The density of asphalt or concrete pavement shall meet relevant standards. Pavement patches are not allowed, especially directly above sensors. Longitudinal and transverse gradients shall both be no greater than 2% and keep uniform. The gradient shall remain consistent for no less than 35 meters ahead and behind the detection zone; a minimum of 25 meters is acceptable under budget constraints. Sections at the bottom/crest of slopes or grade change points are strictly prohibited.
