How much over the speed limit is driving at 100 in an 80 zone?

3 Answers
VonRyder
07/29/25 4:50pm
Driving at 100 km/h in an 80 km/h speed limit zone constitutes a 30% speeding violation. Below are additional details: 1. Laws and regulations: Highways shall indicate lane speed limits, with maximum speeds not exceeding 120 km/h and minimum speeds not below 60 km/h. On highways, the maximum speed for small passenger vehicles shall not exceed 120 km/h, while other motor vehicles shall not exceed 100 km/h. 2. Lane speed limits: For roads with 2 lanes in the same direction, the minimum speed for the left lane is 100 km/h; for roads with 3 or more lanes in the same direction, the minimum speed for the leftmost lane is 110 km/h, and the minimum speed for the middle lane is 90 km/h.
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Kathryn
08/14/25 6:37am
As someone who is quite sensitive to numbers, I did a quick calculation: with a speed limit of 80 kilometers per hour, driving at 100 kilometers per hour means exceeding the limit by 20 kilometers per hour. To calculate the percentage, divide the excess speed by the speed limit and multiply by 100%, which is 20 divided by 80 equals 0.25, and then multiplied by 100% gives 25%. That's a 25% overspeed. Mathematically, it's straightforward, but if you get used to calculating it this way, you can better understand the risks of your driving behavior. For example, driving at 110 kilometers per hour would be a 37.5% overspeed, making accidents more likely. I think everyone should know this basic calculation method, especially when driving, to remind themselves not to overspeed and develop safe habits.
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MacEllie
08/14/25 6:38am
As a parent who frequently travels with children, I am particularly concerned about the safety risks of speeding. Driving at 100 km/h in an 80 km/h zone constitutes a 25% overspeed, which may not sound like much, but in reality, it significantly increases braking distance and becomes even more dangerous on slippery roads. A 25% overspeed means shorter reaction time and higher risk of rear-end collisions, especially during peak traffic hours. I remember once when I was careless and drove too fast, I nearly scraped the car in front of me. Since then, I strictly adhere to speed limits. I recommend fellow drivers install speed alerts and regularly check their speedometers—safety comes first, as even a slight overspeed can lead to serious accidents.
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