A few degrees below zero can't get through the highway.

Mainly depends on the current road conditions, whether there are serious phenomena such as snow and freezing, which are closely related to the specific geographical location, climatic conditions, road facilities and emergency response capabilities.

I. Meteorological conditions and road conditions

When the temperature drops below zero, especially when it is accompanied by snowfall or sleet, the expressway pavement is extremely easy to freeze. At this time, the friction coefficient of the road surface will be obviously reduced, and the driving safety of the vehicle will be seriously affected. Therefore, the meteorological department will issue a road icing warning according to real-time weather conditions to remind drivers to pay attention to driving safety.

At the same time, the traffic management department will take corresponding control measures according to road conditions and weather conditions. For example, in the case of serious road icing, measures such as speed limit, restriction or even closure of expressways may be taken to ensure driving safety.

Second, emergency treatment and road maintenance

In order to cope with the impact of low temperature weather on the expressway, the traffic control department will strengthen road inspection and maintenance. Once ice or snow is found on the road surface, snow removal and deicing operations will be organized immediately to ensure smooth roads. In addition, warning signs will be set up on key road sections to remind drivers to pay attention to safe driving.

At the same time, the traffic management department will also keep close communication with the meteorological department, grasp the weather change information in time and make preparations in advance.

Third, the driver's precautions

In cold weather, drivers should pay special attention to driving safety. In the process of driving, you should keep a safe speed and avoid dangerous operations such as sudden braking and sharp turning. At the same time, we should always pay attention to the changes of road conditions and weather, and take anti-skid measures, such as replacing snow tires and installing anti-skid chains.

To sum up:

There is no fixed standard for highway impassability at MINUS several degrees, and it depends on the comprehensive influence of many factors. The traffic management department will take corresponding control measures according to the actual road conditions and weather conditions to ensure traffic safety. Drivers should also pay special attention to driving safety and take anti-skid measures when driving in low temperature weather.

Legal basis:

Road Traffic Safety Law of the People's Republic of China

Article 40 provides that:

In case of natural disasters, bad weather conditions or major traffic accidents that seriously affect traffic safety and it is difficult to ensure traffic safety by taking other measures, the traffic management department of the public security organ may implement traffic control.

Regulations of the People's Republic of China on the Implementation of Road Traffic Safety Law

Article 8 1 stipulates that:

When a motor vehicle runs on an expressway, it shall comply with the following provisions in case of low visibility meteorological conditions such as fog, rain, snow, dust and hail:

(a) when the visibility is less than 200 meters, turn on the fog lights, low beam lights, position lights and front and rear position lights, the speed shall not exceed 60 kilometers per hour, and keep a distance of more than 100 meters from the vehicle in front of the same lane;

(2) When the visibility is less than 100 meters, turn on fog lights, low beam lights, position lights, front and rear position lights and hazard warning flashlights, the speed shall not exceed 40 kilometers per hour, and keep a distance of more than 50 meters from the vehicle in front of the same lane;

(3) When the visibility is less than 50 meters, turn on fog lights, low beam lights, position lights, front and rear position lights and hazard warning flashlights, and the speed shall not exceed 20 kilometers per hour, and leave the expressway from the nearest exit as soon as possible.