Why are some highways limited to 100 mph while others are limited to 120 mph?
2 Answers
The reason why some highways are limited to 100 mph while others are limited to 120 mph is: Domestic highways are mostly paved with asphalt, and because the friction coefficient between the road surface and tires varies, different sections have different speed limits due to varying road conditions. Relevant information about speed limits is as follows: Introduction to speed limits: Speed limits usually refer to the regulation of driving speed within a certain numerical range over a specified distance of road. Purpose of speed limits: The main purpose is to pre-warn drivers to reasonably control their speed in subsequent sections ahead, prevent the dangers of speeding, and ensure driving safety. Speed limits are an indispensable and most important part of highway transportation safety.
When driving on the highway, I noticed that speed limit differences are mainly related to road safety. Some sections have many curves or steep slopes, like mountainous highways, where the speed limit is set at 100 km/h to make it easier for vehicles to control in emergencies and avoid skidding or running off the road. Areas with heavy traffic also have lower speed limits. During rush hours when there are more people and vehicles, highways are more prone to accidents, so a speed limit of 100 km/h is safer than 120 km/h, reducing the risk of rear-end collisions. Additionally, weather has a big impact. In foggy areas or during the rainy season when roads are slippery, speed limits are lowered. Some sections also have accident black spots with frequent historical incidents, so lower speeds are enforced to prevent accidents. I think these designs are based on actual traffic surveys to ensure safety comes first. As long as you pay attention to changing road signs and avoid speeding, you'll be fine.
