Some weeks ago, I drove on the A3 in Germany, and saw an interesting bridge crossing the highway. It was a mono arc bridge and I thought this would look good in our marble run.

The bridge was planed and build by www.ssf-ing.de where you can find further information.

Update 16.09.24: As most people have problem with the press fit of the square holes and pegs of the arc, I made the square holes biger.

A description how to assable coud be found in the thing part. (since I couldn't upload a PDF file, the extension .txt is added. Remove .txt after download)

Here a link to a Video.