Why do overpasses have curves? 5

The questions are very high-level!

Then we have to ask why there are overpasses? The full name of the overpass is "three-dimensional crossing bridge", and the dictionary definition is: a modern land bridge established at an important traffic intersection in the city, with upper and lower layers, multi-directional driving, and non-disturbing each other.

That is generally set up at the intersection of the two main roads, since it is an intersection, there will be left and right turns, on the flat large intersection, there are round flower beds, all in order to facilitate the direction of circulation, reduce the control of traffic lights!

Crossing on top of existing lines. It is divided into detached and interoperable. The former only ensures that the vehicles on the upper and lower lines pass independently; The latter allows vehicles on the upper and lower lines to pass through each other, and builds complex roundabout ramps on the plane and façade, which occupies a lot of land.

In order to reduce noise, prestressed concrete bridges are mostly used. It's a detour, that is, a curve! In the design of the bridge body, in order to ensure and extend the service life of the overpass, the way of circular curve is adopted to reduce the weight of the car body to concentrate on the bridge deck, so as to prevent serious damage to the bridge body after a long time!

Because when any object moves in a circular shape, there are centrifugal forces, and these forces help to reduce the weight on the bridge deck.

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The overpass is actually a crossing, but it separates the upper and lower roads, so it is more convenient to run.

1. When driving a motor vehicle through an overpass and encountering a turn, reduce the speed of the vehicle 100 to 50 meters away from the exit, turn on the right turn signal, pay attention to the dynamics of the vehicle after the audition, do not overtake, and when the vehicle turns left through the overpass, it should turn right after crossing the bridge and enter the ramp.

Then the right turn is completed, there are many riders who fight lead wrong practices, there is nothing to turn on, like to turn on the emergency flashing lights, this is a very wrong practice, flashing lights are mostly used in high-speed vehicle failures when pulling over.

2. Alfalfa leaf-shaped three-dimensional crossing: when passing through this three-dimensional intersection, all parties go straight to the vehicle according to the original direction, all parties turn right-turning vehicles, through the right ramp lack of bends, and all parties left-turning vehicles, must go straight through the cross-line bridge, turn right into the ramp, and then turn right 180 ° to achieve the purpose of turning left.

3. Roundabout three-dimensional intersection: when passing through this three-dimensional intersection, except for the straight-going vehicle of the lower route can drive in the original direction, other motor vehicles must drive on the ring road and circle in the counterclockwise direction; Drive straight in one direction, and choose the direction of the intersection you are going to.

4. Diamond-shaped vertical crossing: the traffic organization of this intersection is that the straight-going vehicle is the interchange, the right-turning vehicle drives on the ramp, and the left-turning vehicle adopts the plane crossing mode on the secondary road.

5. Two-layer circular three-dimensional intersection: the vehicle on the main road is intersected with the vehicle driving on another intersecting road, and the vehicle can be turned left or U-turn at the roundabout.

6. Interchange overpass: In addition to the alfalfa leaf shape, the overpass in the city is generally used to turn right on the bridge and under the bridge, once entering the overpass, it is forbidden to make a left turn. If you miss the intersection on the overpass, you must continue to drive, take the ring road again, and then get off the bridge at the correct intersection, and it is forbidden to reverse or make a U-turn.

First of all, to drive the vehicle to the overpass, you need to reduce your speed 100 meters away from the exit and turn on your left turn lights. When the car arrives at the overpass, you need to drive the car into the gate of the overpass to make a left turn, and turn again after turning to the left.

The car needs to master the speed of the car when turning, because too fast makes the turn very dangerous, so you must guess that the banquet slows down in advance to pass safely. If the speed is small when the car is cornering, you can brake in time, but if the speed of the car is too fast, it is easy to be dangerous. When turning to the left, the car should make as many lanes as possible, and small turns will affect the driving of other vehicles.

Qibo Zhaozhou car needs to use second gear to turn when turning, and do not turn a big bend when turning to the right, because in most cases the car does not need to look at the red light when turning right, and the car needs to pay attention not to affect the driving of the vehicle when turning.

After crossing the bridge, then press the glide to turn right, and then turn left to the draft.

The overpasses on the ring road are like rainbows;

The overpasses on the ring road are like intertwined dragons;

The overpasses on the ring road are like giant pythons intertwined;

The overpasses on the ring road are still like a gorgeous Milky Way;

The overpasses on the ring road are like patches of clouds;

The overpasses on the ring road are like beautiful ribbons.

Overpasses: The rapid increase in the city's population has led to an increasing number of vehicles, and the crossings of plane interchanges cause vehicle jams and congestion. It is necessary to build overpasses and elevated roads to form a multi-layered three-dimensional layout to improve vehicle speed and passing capacity.

The connection of the urban ring road and the highway network must also be diverted and guided through large-scale interchanges to ensure the smooth flow of traffic. Urban overpasses have become an important symbol of modern cities. In order to ensure that traffic does not interfere with each other, bridges are built at the intersection of roads and railways.

It is widely used in high-traffic areas of highways and urban roads.

Overpass is a modern bridge project, which is characterized by the formation of three-dimensional intersection in three-dimensional space by multi-storey roads. It is the inevitable product of human transportation modernization and urbanization of living areas, one of the urban public infrastructure, and an indispensable part of the efficient transportation system in contemporary society.

Interchange in the narrow sense. Narrow overpass refers to a bridge project in which multiple roads are separated by plane and three-dimensional intersection in the form of viaducts at intersections and can achieve semi-full interconnection, which is limited to automobiles and highways, excluding simple highway and railway cross-line bridges or branch overpasses (commonly found near the entrance and exit of toll stations on high-speed roads).

<> generalized interchange. The generalized overpass refers to the bridge and tunnel project with multi-layer structure and three-dimensional intersection constructed in order to solve the conflict problem of multi-directional vehicles at the intersection on a number of land transportation routes (including bridges and tunnels on water and underwater roads), and the object can refer to all land vehicle transportation vehicles and the main structure facilities of the line where they are located.

<>1. Reduce or eliminate the conflict of vehicles in different directions or types on the original plane, which can alleviate congestion, save driving time, and enhance driving safety;

2. Some structural types of overpasses can divert the traffic volume in the direction of the main road or even the branch road to a certain extent;

3. Overpasses of some structures can be equipped with U-turn ramps to provide a safer U-turn environment for vehicles and not affect the rapid driving of mainline vehicles;

4. It can reduce or eliminate the probability of mixed traffic between motor vehicles, non-motor vehicles, pedestrians, etc., and improve the overall safety factor of the road;

5. Combined with aesthetic design, it can be used as a local town business card to enhance the image of the city, as well as potential value such as setting up advertising booths on bridge piers and other places.

The cross-line bridge crosses the existing line from the ground and consists of a bridge tunnel, an approach road and ancillary structures. When building, the underground pipeline needs to be demolished, and the ancillary works are large, which is far less economical than the construction of cross-line bridges, and the design should pay attention to the requirements of clearance, ventilation, lighting, drainage and anti-icing (severe cold areas).

Overpasses (highway interchanges or overpasses) are called "three-dimensional cross-line bridges", which refer to modern bridges built at important traffic intersections in the city, layered up and down, multi-directional traffic, and do not interfere with each other. Due to the high cost of construction, it is usually only built at the intersection of highways, urban arterial roads, or expressways. Its main function is to enable vehicles in all directions to pass quickly, not controlled by traffic lights at intersections.

It is the inevitable product of the modernization of human transportation and the urbanization of residential areas, one of the urban public infrastructure, and an indispensable part of the efficient transportation system of contemporary society. The most important function of the overpass is to use the method of air isolation to eliminate the conflict of cross traffic on the road plane, alleviate congestion, save driving time, and enhance driving safety. To a certain extent, the traffic flow in the direction of the main road and even the branch road is diverted, so that the straight traffic at the intersection of the two intersections of the brother ridge is unimpeded; In addition, it can reduce or eliminate the mixing probability of motorized vehicles, non-motorized vehicles and pedestrians, and improve the overall safety factor of the road.

Millions of car purchase subsidies.

Overpass is the abbreviation of three-dimensional intersection bridge, when the roads in different directions intersect, the multi-layer three-dimensional intersection bridge built to ensure the smooth flow of traffic, can make vehicles in different directions do not interfere with each other, and drive through on different planes.

Due to the high construction cost, overpasses are usually only built at the intersection between highway interchanges, urban arterial roads or expressways, and the main role is to enable vehicles in all directions to pass quickly without being controlled by traffic lights at intersections. It can reduce or eliminate the chance of mixed traffic between motor vehicles, non-motor vehicles, pedestrians, etc., and improve the overall safety factor of the road.

Interchanges can also reduce or eliminate collisions between vehicles in different directions or types on the original plane, which can alleviate congestion, save driving time, and enhance driving safety. Some structural types of overpasses can divert traffic in the direction of the main road or even the side road to a certain extent. Overpasses of some structures can be equipped with U-turn ramps to provide a safer U-turn environment for vehicles and not affect the rapid driving of main line vehicles.

Photo by Wu Binbin) @2019