# Road Question...

**URL:** <https://forums.speedlife.net/t/road-question/37960>\
**Category:** NYSpeed Off Topic\
**Created:** [October 31, 2007, 8:34pm UTC](https://forums.speedlife.net/t/road-question/37960 "2007-10-31T20:34:08Z")\
**Posts on this page:** 1\
**Showing post:** 19

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**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\
**Post date:** [November 1, 2007, 6:44am UTC](https://forums.speedlife.net/t/road-question/37960/19 "2007-11-01T06:44:33Z")

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Fry beat me to it.

It can be used for traffic counting, speed sensing and axle counting.

Avatar, you’re wrong about needing to know axle to axle distance. Front wheel triggers one sensor, then “t” time later it triggers the second sensor. average V=delta X/ delta t  
DURRR.

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