Select the existing road
locate where the bridge should be
click on the existing road that will be split to the create the bridge
right-click on the first node and click the scissor icon to split the road. Perform the same process with the second node. <info> The grey node confirms you have split the road
Tag the Bridge Section
Select the newly created road section (the segment between the two nodes). The quickest approach is to use Add a bridge, in the Issues pane in the Edit Feature panel (on the left of the OSM ID interface).
Using Add a bridge will add two tags: bridge=yes layer=1
QA your newly added bridge. Bridge segments in OSM will have a black border running parrell with the road you’ve added. You use this to visually confirm you’ve added the bridge to the correct road segment
Correctly added bridge
Save your edit. Add a template