If the speed of overtaken vehicle is 80Kmph, then the design speed is ___________

To determine the design speed given the speed of the overtaken vehicle, it's important to consider the context of road and traffic safety design principles. However, with the information provided, we can conclude that the design speed should typically be higher than the speed of the overtaken vehicle to maintain safe overtaking maneuvers.

1. ### Break Down the Problem

1. Identify the speed of the overtaken vehicle: 80 km/h.
2. Understand the design speed concept in road safety.

2. ### Relevant Concepts

• Design speed is generally set higher than the maximum speed of vehicles to ensure safety and efficient traffic flow.

3. ### Analysis and Detail

• The design speed is meant to provide a buffer for safe overtaking, ensuring that vehicles can pass without difficulty.
• A common practice in road design is to establish the design speed at least 10-20 km/h above typical maximum speeds encountered on roads.

4. ### Verify and Summarize

Assuming the design speed intends to allow safe overtaking, if the overtaken vehicle travels at 80 km/h, a design speed of 90-100 km/h is advisable.

Final Answer

The design speed should be set around 90-100 km/h for optimal safety.