# Footballs freaky yellow yard lines

**URL:** <https://boards.straightdope.com/t/footballs-freaky-yellow-yard-lines/30370>\
**Category:** Factual Questions\
**Created:** [August 22, 2000, 11:52pm UTC](https://boards.straightdope.com/t/footballs-freaky-yellow-yard-lines/30370 "2000-08-22T23:52:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Occam](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@Occam](https://boards.straightdope.com/u/Occam)\
**Post date:** [August 22, 2000, 11:52pm UTC](https://boards.straightdope.com/t/footballs-freaky-yellow-yard-lines/30370/1 "2000-08-22T23:52:30Z")

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Forgive me if this was already asked, but:

Watching TV I keep seeing a glowing yellow line marking ten yards away from the scrimmage line. I know why it’s there…but how do they do it.

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**Author:** ![manhattan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/manhattan/32/7_2.png) [@manhattan](https://boards.straightdope.com/u/manhattan)\
**Post date:** [August 23, 2000, 12:07am UTC](https://boards.straightdope.com/t/footballs-freaky-yellow-yard-lines/30370/2 "2000-08-23T00:07:12Z")

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From [this thread](http://boards.straightdope.com/sdmb/showthread.php?threadid=8983) comes [this link](http://www.pvi-inc.com/index2.html).