A rail line on the center of a 50-ft street makes a 55°24’ turn into another street of equal width. The corner curb line has R = 10 ft.What is the largest R that can be given a circular curve for the track centerline if the law requires it to be at least 10 ft from the curb? Tabulate all data required to lay out by deflection angles and incrementalv chords, at the indicated stationing, for the circular curves of Problems 24.20 and 24.21.

Problem 24.20:

The R for a highway curve (arc definition) will be rounded off to the nearest larger multiple of 100 ft. Field conditions require M to be approximately 20 ft to avoid an embankment. The PI = 94 + 18.70 and I = 23°00’ with stationing at 100 ft

Problem 24.21:

For a highway curve, R will be rounded off to the nearest multiple of 10 m. Field measurements show that T should be approximately 80 m to avoid an overpass. The he PI = 6 + 356.400 and I = 13°20’ with stationing at 30 m.