The Cycling Embassy have launched a new tool on their website called 'insert loved on here' intended to help people flag up particularly dangerous infrastructure - there's a blog here
https://www.cycling-embassy.org.uk/blog/2017/06/30/insert-loved-one-here
The actual tool is here https://www.cycling-embassy.org.uk/insert-loved-one-here/create - you can then download the marked up image to use on Twitter, FB or websites
and there's a gallery of images here https://www.cycling-embassy.org.uk/insert-loved-one-here/gallery
I'm sure there's a few examples in Edinburgh that you could flag up ...