The United States is known as the "country on wheels".

Their utilization of cars is very high, almost every household has at least one or two cars, which is one of the highest penetration rates of cars in the world.

In the United States, there is a wide variety of road networks, all very smooth and spacious.

So not only Americans like to drive themselves, foreign tourists are also inclined to be able to drive in the United States, galloping on the endless highways.

However, it may not be enough to just have a heart to drive yourself, you must know the highway signs in the United States before you go and be well prepared.

There are four different systems of highways in the United States, which are interstate highways, national highways, state highways and county highways.

At present, information technology intelligence as an important means to promote the transformation of traditional transportation to modern transportation, by the world's general attention.

Intelligent highways have been developed in foreign countries for a long time and play a role in traffic safety, congestion control and environmental protection.

The development of intelligent highway in the United States, in the late 1980s, carried out research on intelligent vehicles and highway systems.

The development of rapid. early 1990s, the United States in Los Angeles built a section of "drive Wanda highway".

This highway is an experimental "intelligent highway", which is based on the combination of highway system and communication system, it can improve the capacity of the highway without paving additional highway.

Sweden has opened the smartest section of road - the European E4 road between the northern Swedish cities of Pite and Lule.

This smart road is equipped with solar sensors that can warn of icy roads, accident congestion and other dangerous situations for moving vehicles.

The solar cell sensors are attached to an asphalt and binder pavement, and each device includes lights, information processors, storage, sensors, and information exchanges.

The device warns of icy roads and hazardous conditions hundreds of meters in advance through color-changing indicators.

Britain's smart highways are equipped with solar-powered traffic signs, road monitoring sensors, standby obstacle-clearing vehicles, and electronic information signs, which can greatly improve the operation of the highway.

The UK's smart highway construction has been effective in coping with the 23% increase in traffic since 2000, increasing the capacity of the busiest highways by 1/3, significantly improving the reliability of highway operations and a lower percentage of fatalities on highways.

In addition to smart highways, there are also such highways for self-driving.

If Highway 61 is the National Road of Melancholy, then the soundtrack to Nevada Highway 50, known as the Lonely Road, should be Philip Glass' esque drone.

Highway 50 stretches from the coastline of Sacramento, California, to Ocean City, Maryland, but the Nevada section of it has attracted attention for its characteristic sense of desolation and bleakness.

This stretch of road crosses the remote desert valley, stubborn and bleak like a black line drawn by a marker, stretching from your front to the sky.

The nickname "The Lonely Road" was a Life magazine summary of the highway's character in the mid-1980s.

The nickname itself was not meant to be flattering, but Nevada decided to embrace it and use it to appeal to those with a unique aesthetic for emptiness and depression.