Take a look at all these photos of city streets in the rain. I found them all on google image search and I am shamelessly hotlinking them:<\/p>\n
1<\/a> 2<\/a> 3<\/a> 4<\/a> 5<\/a> 6<\/a> 7<\/a> 8<\/a> 9<\/a><\/p>\n I was driving home from work today in the rain, and saw many similar scenes. However I noticed something interesting that I have never noticed before. The street lights, car lights, traffic lights, etc. all reflect off of the wet surface of the road. However since the road is not a mirror-flat surface, the reflection is smeared out or diffused due to the rough texture of the road. So my question is this: why is the smearing or diffusion of the reflection almost entirely in the vertical direction? Certainly the surface of the asphalt or concrete does not have a sufficiently heterogeneous asperity (i.e. the roughness is uniform from all directions) to account for this. Shouldn’t the light spread out as far horizontally as it does vertically? Any insights here? <\/p>\n","protected":false},"excerpt":{"rendered":" Take a look at all these photos of city streets in the rain. I found them all on google image search and I am shamelessly hotlinking them: 1 2 3 4 5 6 7 8 9 I was driving home … Continue reading
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![2<\/a>](\"http:\/\/farm6.static.flickr.com\/5125\/5252519481_50a9e54bd8.jpg\"){kind=link}
![3<\/a>](\"http:\/\/theuncommonreader.files.wordpress.com\/2009\/04\/street-lights-jefferson-avenue-at-night.jpg?w=800\"){kind=link}
![4<\/a>](\"http:\/\/www.digitaldoodles.com\/system\/files\/LonsdaleInTheRain.jpg\"){kind=link}
![5<\/a>](\"http:\/\/fc08.deviantart.net\/fs27\/f\/2008\/183\/a\/d\/Street_Lights___Rain_by_niazali.jpg\"){kind=link}
![6<\/a>](\"http:\/\/wwwdelivery.superstock.com\/WI\/223\/1841\/PreviewComp\/SuperStock_1841-41027.jpg\"){kind=link}
![7<\/a>](\"http:\/\/2.bp.blogspot.com\/-LR0EUmLMlZg\/T6hEa27-37I\/AAAAAAAAAQI\/qKtiixjPS7c\/s1600\/raining+nite+wm.jpg\"){kind=link}
![8<\/a>](\"http:\/\/images.china.cn\/attachement\/jpg\/site1007\/20080504\/001109b42f73098751b607.jpg\"){kind=link}
![9<\/a><\/p>\nI was driving home from work today in the rain, and saw many similar scenes. However I noticed something interesting that I have never noticed before. The street lights, car lights, traffic lights, etc. all reflect off of the wet surface of the road. However since the road is not a mirror-flat surface, the reflection is smeared out or diffused due to the rough texture of the road. So my question is this: why is the smearing or diffusion of the reflection almost entirely in the vertical direction? Certainly the surface of the asphalt or concrete does not have a sufficiently heterogeneous asperity (i.e. the roughness is uniform from all directions) to account for this. Shouldn’t the light spread out as far horizontally as it does vertically? Any insights here? <\/p>\n","protected":false},"excerpt":{"rendered":"Take a look at all these photos of city streets in the rain. I found them all on google image search and I am shamelessly hotlinking them: 1 2 3 4 5 6 7 8 9 I was driving home … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/posts\/601"}],"collection":[{"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/comments?post=601"}],"version-history":[{"count":1,"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/posts\/601\/revisions"}],"predecessor-version":[{"id":602,"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/posts\/601\/revisions\/602"}],"wp:attachment":[{"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/media?parent=601"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/categories?post=601"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.moroha.net\/blog\/wp-json\/wp\/v2\/tags?post=601"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}](\"http:\/\/3.bp.blogspot.com\/-dWHDJ5gqxU8\/T5NtZlHWi0I\/AAAAAAAADOs\/zArWoyOo5Ak\/s1600\/nightlights.jpg\"){kind=link}