The concept of "ramp" and traffic precautions

Concept of Expressway Ramp and Traffic Precautions

"Ramp", also known as approach road, is a professional term in engineering academic field. Its concept is an auxiliary road connecting the main highway, and it is a connecting road connecting other roads and toll stations. The popular explanation is the connection section, because the car can't "jump" directly on the trunk line and accelerate directly to120km/h; Different sections must be reserved for connection to ensure safe acceleration to high speed, and the connected sections generally cover two sections: ramp and acceleration lane.

Ramp commonly known as ramp

Old drivers in Snail Bend often call the ramp this way, because the speed limit of the ramp is very low, overtaking, parking and reversing are not allowed, so why should the ramp strictly limit the commuting state? There are three reasons.

High-altitude curved roads and narrow expressways are always higher than ordinary paved roads, and these roads are basically on elevated bridges.

If you want to enter the expressway, you not only need to accelerate, but also the driving state is "climbing". When the car climbs a hill, it will unconsciously increase the throttle to increase the speed. If the speed on the ramp is too fast, it will cause the speed when merging into the main line. At this time, it may collide with large and medium-sized cars and hazardous chemicals transport vehicles passing on the right side of the main lane. So how to solve this problem?

"Winding" is the best way. Ramps are often designed as circular spiral roads, and the turning angle of vehicles driving on ramps is very large. When driving on the ramp, I often feel nauseous, because the rapid change of the reference in front affects the operation of my brain. If you don't feel this way, you must drive at a low speed. If you don't want the vehicle to get out of control or even rush out of tens of meters, it is very important to control the low speed reasonably.

Overtaking, parking and reversing are not allowed on the ramp precisely because of the "curve" and narrow road. Overtaking in corners will have a great visual blind spot. At this time, accelerating overtaking is easy to misjudge the extension direction of the road, and the probability of hitting the guardrail and hitting the subgrade will also increase. Therefore, overtaking on the ramp is absolutely not allowed. As for parking and reversing, I don't need to go into details. These two driving behaviors will force other vehicles to overtake, that's all.

Ramp speed limit

The ramp speed limit of most expressways is 40km/h, and the "speed concept" when entering the expressway from the entrance still stays at the low speed standard. Driving at a standard speed of 40 km/h on a ramp will not feel slow. Therefore, speeding on the ramp rarely occurs in the driving stage, but it is often easy to overspeed when getting off the expressway; Because driving at a speed exceeding 100 km per hour for a long time will form a short-term subconscious of "speed standard", it is easy to raise the speed to the overspeed standard after driving into the expressway, and on the ramp is no exception.

Most high-speed kilometers of ramps will have traffic records to monitor whether they are hungry. Theoretically, they don't measure the speed and record it. However, in recent years, traffic accidents caused by overtaking on high-speed ramps frequently occur. In order to control the speed reasonably, the ramp speed is measured. However, there is no need to worry that entering the ramp at high speed cannot effectively slow down, because the middle section of the expressway connecting the ramp is both an "acceleration lane" and a "deceleration lane"; In this section, you should control the speed below 60 km/h, and then enter the ramp to slow down, so that you won't feel flustered.

Summary: The design of expressway is very scientific, which section should be driven and at what speed, all of which are based on the rigorous test and calculation results of many production vehicles. Therefore, there is nothing wrong with obeying traffic rules. As an ordinary car user, don't use experience to challenge other people's majors.