The Hangzhou-Shaoyang-Ningbo Expressway, which is the Hangzhou-Ningbo Expressway Repeated Line. Starting from the Xiasha hub of Hangzhou Bypass Expressway and ending at the Chaiqiao hub of Ningbo Pengshan Port Dredging Expressway, the line scheme is about 161 km long, with a planned two-way six-lane road and a design speed of 120 km/h. It is expected to be opened to traffic in 2021.Currently the only expressway between Ningbo and Hangzhou, Hangzhou-Ningbo Expressway opened in 1996, is the first expressway in Zhejiang, but also currently one of the busiest highways in Zhejiang, according to estimates to 2030 the average daily traffic flow of 200,000 vehicles, close to saturation.
Why is there a maximum speed limit on the highway?
We know that there is no speed limit on some highway sections in Germany, while most countries around the world have maximum speed limits, such as 150Km/h in Italy, 130Km/h in France and 120Km/h in China, why is that?
--Human physiological factors
A driver's vision, field of view and reaction time are the three most important elements that affect traffic safety. A driver driving a vehicle to observe objects ahead is dynamic and the human visual function is very much affected by the speed of movement, with increased speed, reduced vision (power vision) and narrowed field of view (tunnel vision).
According to scientific tests, at a speed of 72Km/h, the normal 1.2 vision drops to 0.7; at a speed of 100Km/h, the field of vision is only 45 degrees. The normal reaction time for a driver (spotting an object - making a judgment - taking action) is generally about 2.5 seconds, so for a vehicle traveling at 120 Km/h, the reaction distance is: 120x1000x2.5/60=83 (m), and if you add in factors such as vehicle braking and inertial coasting, the effective reaction distance is actually more than a hundred meters.
Assume that there is an obstacle 100m away and that the speed of the vehicle is 33m/s at 120Km/h. You have 3s to react. The speed of the vehicle is 44m/s at 160Km/h. You only have 2.2s to reflect. For most people, it's not enough. Therefore most people will not be able to react properly in time to an unexpected event at 160Km/h.
--Factors of the vehicle
Although the performance of family cars is getting better and better nowadays, 120KM/H is no longer a problem for ordinary family cars, not to mention some luxury cars. But don't forget that cars are not the only ones running on the highway, there are also some vans and trucks. The speed of those heavily loaded trucks on the uphill section is even less than 60KM/H.
If the speed limit is too high in these conditions, the speed difference between the various types of vehicles will be too great, further increasing the chances of an accident.
The level and quality of drivers is definitely one of the important reasons for the speed limit. In Germany, some highways do not have a speed limit, but the probability of traffic accidents is very low, which is greatly related to the high driving quality of drivers.
--Energy saving and environmental considerations
As the speed of the vehicle increases, wind resistance shows a coefficient growth, the explosive growth of wind resistance makes the vehicle needs more power, which will significantly increase the vehicle energy consumption, the intuitive embodiment is a significant increase in fuel consumption of 100 km, generally speaking 100-120 km is the best combination of vehicle performance, speed, safety and other factors, both fuel saving, environmental protection, but also safe and fast.
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