# What are those dents in I-90 outside Seattle?

**URL:** <https://boards.straightdope.com/t/what-are-those-dents-in-i-90-outside-seattle/422061>\
**Category:** Factual Questions\
**Created:** [October 9, 2007, 5:27am UTC](https://boards.straightdope.com/t/what-are-those-dents-in-i-90-outside-seattle/422061 "2007-10-09T05:27:11Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![scr4](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@scr4](https://boards.straightdope.com/u/scr4)\
**Post date:** [October 9, 2007, 5:45am UTC](https://boards.straightdope.com/t/what-are-those-dents-in-i-90-outside-seattle/422061/2 "2007-10-09T05:45:50Z")

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[Dowel bar retrofit](http://en.wikipedia.org/wiki/Dowel_bar_retrofit)?

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