What is the actual speed when the dashboard shows 70?

[DeErin]

The dashboard shows 70Km/h, but the actual speed is between 67-69Km/h. The speed displayed on the dashboard is not the true speed. Here are the relevant explanations: 1. Design reason: In most cases, the speed displayed on the dashboard is not the actual speed of the car. Many dashboards show a speed higher than the actual speed. For example, if the displayed speed is 90Km/h, the actual speed is less than 90Km/h, possibly between 87-89Km/h. The main reason for this design is to serve as a warning and to ensure driving safety. 2. Regulations: According to the national standard "Speedometer for Automobiles", the indicated speed on the speedometer shall not be lower than the actual speed, and the relationship between the indicated speed and the actual speed shall comply with the formula "0 ≤ indicated speed - actual speed ≤ actual speed/10 + 4km/h". It cannot be lower than the actual speed, nor can it be much higher than the actual speed.

[StJessica]

I've been driving for over a decade, and every time the dashboard shows 70 kilometers per hour, the actual speed is usually slightly lower, around 65 to 68. This design is quite clever—manufacturers intentionally set the display value higher to help us avoid speeding tickets. I've compared it with GPS or mobile apps, and the error is typically between 3% to 5%. Looking back, when I was younger, I cared more about the numbers, but now I understand this difference helps protect safety by preventing us from taking risks in speed-limited zones. I recommend not just focusing on the dashboard but also combining it with road conditions while driving. Get into the habit of observing the actual speed and regularly checking tire pressure and wear—these small details can make your journey smoother and safer.

[PaigeLee]

As someone who has been studying cars for years, I know that when the dashboard displays 70 km/h, the actual speed typically fluctuates between 66 and 68 km/h. This discrepancy stems from safety regulations, as automakers must ensure the speedometer reading is not lower than the true value to prevent accidental speeding. Through my own tests using professional tools or GPS, the error usually ranges between 3% and 5%, with tire size or road conditions slightly adjusting the reading. Don’t find it odd—this strategy is practical, reminding us to focus on speed limits rather than chasing higher numbers. While driving, pay more attention to the external environment; driving slower is steadier, especially in rain or on winding roads, where a slightly lower actual speed brings peace of mind.

[Wright]

I always notice when my speedometer shows 70 km/h, the actual speed is often around 67. This thoughtful setting helps us stay within speed limits and avoid fines. From a safety perspective, don't expect the gauge to be perfectly accurate—having the true speed slightly lower makes driving more reliable. In areas with a 70 km/h limit, showing 73 might still comply; the key is developing steady driving habits. When slowing for curves or merging, don't fixate on the numbers—focus on steering safely. Any speed discrepancy exists for our benefit. Always drive responsibly, use GPS to verify speeds, and ensure every trip stays safe.