We will need the latitude and longitude location of the tunnel. You can find these easily using this web page. https://gps-coordinates.org
What coloured marker would you suggest for the tunnel?
Please enter below some comments on the tunnel that will help over cyclists.
If you have an photo of the tunnel please upload it here. There is a 2500KB limit so you may have to resize it if your image is larger.
If you have your own cycling related website or blog enter the url here.
Please check the required fields.