Traffic Headway Calculator
Use simple distance, speed, and time relationships with explicit unit conversion.
A QUICK WALKTHROUGH
How to use this tool
- Choose whether to calculate time headway or distance.
- Enter positive distance and speed values with their units.
- Review the arithmetic result; this tool provides no road-safety advice.
Arithmetic only
Headway time equals distance divided by speed. Reverse calculation uses distance = speed × headway time. Inputs are converted to SI units before calculation.
Clear scope
This tool does not assess traffic conditions, following distance, road safety, or driving decisions.
GOOD TO KNOW
Common questions
What does headway mean here?
It is the time represented by a distance at a stated speed, calculated as distance ÷ speed.
Can I calculate distance instead?
Yes. Choose distance mode and enter speed plus time headway.