Merging roadways
You can make a new roadway by merging two existing roadways. Each of the original roadway records is expired.
Distances on the new, merged roadway will be measured from the start of the first roadway you specify. So if you merge Roadway 1, which is 35 miles long, with Roadway 2, which is 12 miles long, mile 0 of the original Roadway 2 becomes mile 35 of the new roadway. Thus, a sign that was position 5 miles from the start of the original Roadway 2 is now 40 miles from the start of the merged roadway.