# What are these road markings **URL:** \ **Category:** Factual Questions\ **Created:** [February 6, 2015, 4:43pm UTC](https://boards.straightdope.com/t/what-are-these-road-markings/711984 "2015-02-06T16:43:15Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![bizerta](https://avatars.discourse-cdn.com/v4/letter/b/3be4f8/32.png) [@bizerta](https://boards.straightdope.com/u/bizerta)\ **Post date:** [February 6, 2015, 4:43pm UTC](https://boards.straightdope.com/t/what-are-these-road-markings/711984/1 "2015-02-06T16:43:15Z")
They appear for about 1.5km on the downslope of a highway west of Hilo. Then, they appear on the upslope side for about 1/2 km at another location on the same highway. Wikimapia > **[Wikimapia - Let's describe the whole world!](http://wikimapia.org/#lang=en&lat=19.697953&lon=-155.226399&z=19&m=b)** > > Wikimapia is an online editable map - you can describe any place on Earth. Or just surf the map discovering tonns of already marked places. Street level Photo: [![](http://www.zblist.com/141107_231323_3771_Hawaii.jpg) ](http://www.zblist.com/141107_231323_3771_Hawaii.jpg) ---
**Author:** ![Palooka](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/palooka/32/2902_2.png) [@Palooka](https://boards.straightdope.com/u/Palooka)\ **Post date:** [February 6, 2015, 5:10pm UTC](https://boards.straightdope.com/t/what-are-these-road-markings/711984/2 "2015-02-06T17:10:33Z")
They’re supposed to make drivers slow down by messing with their perception of speed or something. ---
**Author:** ![Machine\_Elf](https://avatars.discourse-cdn.com/v4/letter/m/82dd89/32.png) [@Machine\_Elf](https://boards.straightdope.com/u/Machine_Elf)\ **Post date:** [February 6, 2015, 5:42pm UTC](https://boards.straightdope.com/t/what-are-these-road-markings/711984/3 "2015-02-06T17:42:23Z")
[Bad Turn at Mile 11](http://makaala.blogspot.com/2012/12/saddle-roadspeedway.html) ---
**Author:** ![John\_Mace](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/john_mace/32/185_2.png) [@John\_Mace](https://boards.straightdope.com/u/John_Mace)\ **Post date:** [February 6, 2015, 7:40pm UTC](https://boards.straightdope.com/t/what-are-these-road-markings/711984/4 "2015-02-06T19:40:17Z")
Shark crossing.