Definition
Also called decelerating ridge, it is a traffic facility installed on the highway to slow down the passing vehicles. The shape is generally striped or point-shaped. The material is mainly rubber or metal. It is usually yellow and black to attract visual attention. The road is slightly arched to achieve the purpose of vehicle deceleration. It is generally installed at highway crossings, industrial and mining enterprises, schools, residential quarters, and other road sections that require vehicles to slow down and road sections that are prone to traffic accidents. They are used to slow down motor vehicles and non-mechanical vehicles. A new type of traffic-specific safety setting for the speed of motor vehicles. Speed ​​bumps have greatly reduced accidents at various traffic intersections, and are a new type of special facility for traffic safety. The car is safe in driving and serves the purpose of buffering and decelerating, improving the safety of traffic crossings. At present, speed bumps are widely used in highways all over the world.
　　Rubber speed bump
　　 is designed according to the principle of the angle between the tire and the ground special rubber when the car is running, and is made of special rubber. It is a new type of special traffic safety device that is set at the entrance of highway crossings, industrial and mining enterprises, schools, residential quarters, etc. to slow down the speed of motor vehicles and non-motor vehicles. Compared with the original cement ridge and steel pipe, the rubber speed bump has shock absorption, excellent compression resistance, long life, less wear on the car, less noise, yellow and black, distinct colors, no need to repaint every year, and beautiful Generous and other characteristics. After the use of speed bumps, accidents at various traffic intersections are greatly reduced, and it is a new type of special facility for traffic safety.
　　Composition and general requirements
　　1.1 Composition
　　 Rubber deceleration ridge is composed of yellow and black rubber deceleration ridge units.
　　1.2 General requirements
　　 The rubber deceleration ridge should be integrally formed, and the outer surface should have stripes that increase adhesion. Each deceleration ridge unit should have retroreflective material that is easy to identify at night when facing the driving direction of the vehicle. The surface should be free of pores, no obvious scratches, lack of material, uniform color, and no flash. The name of the production unit shall be suppressed on the surface of the rubber deceleration ridge. If it is connected to the ground by bolts, the bolt holes should be counterbored. The units of the deceleration ridge should be connected in a reliable way.
　　 The cross section in the width and height direction of the deceleration ridge unit should be approximately trapezoidal or arc. The width dimension should be in the range of (300 mm±5 mm)～(400 mm±5 mm), and the height dimension should be in the range of (25 mm±2 mm)-(70 mm±2 mm). On highways and urban roads The ratio of the height to the width of the rubber deceleration ridge used on the ridge should not be greater than 0.7
　2 Pressure resistance
　　 A two-axle car with a vehicle weight of 20 t passes through the rubber deceleration ridge fixed on the road at a speed of 40 km/h. After the test, visually inspect the sample. After the test, the rubber deceleration ridge should not be damaged or cracked.
　　3 Physical properties
　　3.1 Elongation at break
　　The elongation at break of the surface material of the rubber deceleration ridge should not be less than 200%, and the elongation at break of the surface material of the rubber deceleration ridge used on highways and urban roads should not be less than 250%.
　　3.2 Tensile strength
　　The tensile strength of the surface material of the rubber deceleration ridge should not be less than 6.0 MPa, and the tensile strength of the surface material of the rubber deceleration ridge used on highways and urban roads should not be less than 8.5 MPa
　　3.3 Shore A hardness
　　The Shore A hardness of the surface material of the rubber deceleration ridge should be in the range of 65-85.
　　3.4 Tear strength
　　The tear strength of the surface material of the rubber deceleration ridge should not be less than 20 kN/m
　　3.5 Abrasion reduction
　　 The abrasion reduction of the surface material of the rubber deceleration ridge should not be greater than 0.8 cm3/1.61 Km.
　　3.6 Impact elasticity
　　The impact elasticity of the surface material of the rubber deceleration ridge should not be less than 20%
　　4 Retroreflective performance
　　 The retroreflective performance of the rubber deceleration ridge unit facing the direction of the vehicle should not be lower than the requirements specified in Table 1.
　　5 Climate and environment adaptability
After 　　 cast steel deceleration belt is subjected to various environmental tests, the rubber deceleration ridge should be free of discoloration, cracks, peeling, warping, etc., and its elongation at break and tensile strength should still meet the requirements of 3.
　　6 Solvent resistance
　　 After being wiped with 93 gasoline, the rubber speed bump should show no obvious signs of dissolution or damage.
After the rubber deceleration ridge is wiped by No. 0 diesel, there should be no obvious traces of dissolution or damage.
　　 After the rubber deceleration ridge is wiped with SAE 5W-30 lubricant, there should be no obvious traces of dissolution or damage.

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