What does the black circle with a 30 and a slash mean as a road sign?

1 Answers
LeHailey
07/29/25 11:43am
The road sign with a black circle, the number 30, and a slash indicates the end of a 30 km/h speed limit. Below are detailed explanations regarding vehicle speed: 1. Overview: Vehicle speed refers to the distance a vehicle travels per unit of time, commonly measured in kilometers per hour or meters per second. Vehicle speed is one of the three key parameters in traffic flow theory and plays a significant role in traffic flow studies. 2. Others: Vehicle speed can also broadly refer to the speed of motor vehicles. Depending on different applications, vehicle speed is categorized into spot speed, running speed, and design speed. Spot speed is the instantaneous speed of a vehicle passing a specific point on the road. Design speed is the speed set to determine the design parameters of various road geometric elements and ensure their coordination.
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