In recent years , the deceleration zone was set up and expanding the scope of application of the potential , from the previous plant, internal roads and urban residential alley lanes gradually expanded to highways, urban roads, as long as the vehicle enters the mouth of the unit plane intersects with the road , it is the vehicle was traveling on the road traffic into and out of its internal threat , there was the set deceleration zone requirements. The deceleration zone type is varied , variety, there is a certain height on the road Toru cement concrete has installed reflective highlights on the road signposted ( Studs ) , there are a number of transport facilities set up the installation manufacturers of rubber speed humps , there is a certain thickness in the areas designated in hot melt road paint , etc. , whether or not compliance with the relevant standards and norms , as long as they feel able to force passing vehicles to slow down is to spend almost all ways .
Under daily observation shows that the cross-sectional shape of the deceleration zone approximated as a circular arc -shaped, in order to simplify the process of collision , we ignore the tire elasticity, the tire as a rigid body , and deceleration of the wheel when the collision with a geometric analysis , we can get the axle velocity and acceleration versus time . Through data shows that hump reducer impact with respect to the vehicle speed at about 30 meters to the deceleration zone before the adoption of a range of about 20 meters , when the driver traveling to the deceleration zone 30 meters distance , the start slow , be approximated by a straight line uniform deceleration movement , reach deceleration with time as uniform through the deceleration zone . When the vehicle speed is too large by vibrating too much easy fly out , affecting the driver and passenger safety.
When the deceleration zone settings and manager immersed in forcing the passing vehicles with significant deceleration deceleration joy of victory , when we are driving a vehicle traveling on a road on both sides of all cells , the unit export locations are set up speed humps on the road , we can not help but ask : what kind of a road it ? Set the deceleration zone , whose interests are safeguarded ? During deceleration deceleration zone beyond what brought us back to new problems ? First, the current road speed hump to set up and use problems
Deceleration zone is not a legal jargon, in our current existing traffic laws, regulations and transport facilities are no national standards for deceleration with this specialized title , people used to be on the road for all motor vehicle deceleration force facilities collectively referred to as deceleration zone . In the absence of laws, regulations and national standards to verify the identity of its use , it is inevitable there are some problems .
( A ) the setting most deceleration facilities and the lack of legal basis for national regulations
Current deceleration in all kinds of facilities , to find relevant settings based on the deceleration markings, "Road Traffic Signs and Markings " (GB5768-1999) so the gear marking requirements : white reflective gear marking dashed , according to the set different positions , may be a single dashed double-dashed line , and repeated three times , perpendicular to the driving direction . To warn the driver of the vehicle in front should slow down , located at mainline toll plaza, exit ramp proper position . Deceleration marking according to the following principles configurations: the vehicle through the marking roughly equal time intervals , in order to facilitate travel speed gradually come down.
In the transportation industry standard " road marking paint " (JT/T280-2004) , the vibration type road marking paint explicitly listed within the industry standard known as the 3rd hot melt marking paint , marking paint is usually vibration is also called marking as protrusions , rainy night marking , etc., and can be divided from the areas designated dot shape , box -type vibration marking and ribs . Vibration marking paint and pavement is formed through a certain height , so that when the vehicle through a slight concussion and noise which prompted the driver of the vehicle to slow speed.
In addition it hard to find a basis for the deceleration facilities and standardized , according to our current highway , urban road design norms , highways and urban roads transport facilities should be set to meet the "Road Traffic Signs and Markings " (GB-5768 ) requirements , those without legal basis and the national industry standard called the deceleration zone, use the setup process produces some of the legal consequences also inevitable .
( Two ) barrier -type deceleration range is any use of the facility to expand
Such deceleration facilities mainly refers to production of a number of transport facilities rubber ( plastic ) deceleration zone , I believe that can be referred to as obstacles reducer facilities. In accordance with the manufacturer's product description, rubber ( plastic ) gear set with reference to the application of foreign experience, product designers on the height and width of a special design, but such facilities did not expressly approved by national standards , its use is only limited to the toll lanes , gardens , residential, factories, car parks , garages , gas stations and other specific places. However, in practice, the use of this type of deceleration facilities were arbitrarily expanded the scope of the highway and urban road use gradually increased, although you can receive a better slowing effect , but normal traffic on the road cause greater effect was a lot of people's criticism.
( Three ) barrier -type deceleration excessive use of facilities and road traffic management principles prevailing in the trunk does not match the first , and affect the efficiency of road traffic
Of road traffic safety laws and regulations identified in the implementation of an intersection without traffic lights control the traffic trunk first principles , branch and sub- road vehicles should pay attention to slow down or stop to . At present, a considerable number of obstacles reducer facilities provided in various intersections dry road, forcing traffic trunk of the vehicle deceleration , and if the road is set too slow facilities , leading to passing vehicles frequency deceleration , it will undoubtedly greatly affect road traffic efficiency .
Deceleration zone is also called deceleration ridge , is installed on the highway so that the deceleration of the vehicle after transport facilities , the general shape for the strip , but also a little bit like , the main material is rubber , there is a metal , generally yellow and black and white to cause visual Note that the road is slightly curved to achieve the purpose of vehicle deceleration , generally set at the road crossing , industrial and mining enterprises , schools , residential areas and other needs of the entrance sections of the vehicle to slow down and easily lead to accidents sections , is used to slow vehicles, exercise of non-motorized transport speed of the new special security settings. Deceleration with a large extent reduce the traffic to crossing accidents , traffic safety is a new dedicated facility . Car in motion both safe and deceleration cushion purpose of improving safety of traffic crossing .
( A ) the principle of legality
Our participation in the public security traffic management department deceleration facility setup work , it should be carried out strictly in accordance with the principle of legality , in principle, to set the deceleration facilities must be within the existing traffic laws and regulations as well as transport facilities national standards, industry standards as well.
( Two ) the principle of reasonable caution
Set on the road have been built in the slow road facilities should be considered linear design , traffic safety , capacity and other factors, some really impact on traffic safety , such as downhill and road junction points or sharp turns and other special sections , in line with cautious reasonable, taking into account the overall road traffic safety and road traffic efficiency , especially set deceleration effect is obvious, a great impact on road traffic barriers reducer facility , the traffic police department in conjunction with the road by the competent authorities , road design units jointly after the demonstration be implemented , to avoid arbitrariness and deceleration facility setting set within local roads too dense .
( Three ) the implementation of deceleration facilities and road design combine to enhance the scientific nature of deceleration facilities .
Actively to the road design and construction units to provide comments, alterations, new roads, the road deceleration settings fusion facility design and construction of the road , by road designers designed considering the better sections of road safety issues Bureau overall traffic efficiency and road between . The locations of the visual target deceleration lane is mainly corners and other dangerous locations , new markings painted on the lane lines are marked inside the 5 cm , the use of the traffic engineering and traffic psychology theory, so that the driver into the corner , I felt the front driveway more and more narrow , thus reminding them to slow down . Meanwhile, the dashed block set emphasizes the lane boundary contours can be increased to the driver under adverse weather conditions distinguishing lane , thereby reducing collision accidents.