How does the minimum stopping distance before an uncontrolled drawbridge compare to the minimum stopping distance before a railroad crossing?

49 CFR 383.117(a)(4), proper procedures at railroad-highway grade crossings and drawbridges; AAMVA CDL Manual Section 4.3.5 to 4.3.6, p. 4-2 to 4-3

Mixing up these two distances is a common exam mistake because both scenarios involve stopping before a hazard crossing. Knowing the exact numbers for each, 15 to 50 feet for trains versus at least 50 feet for a drawbridge, is tested directly and matters in practice since a bridge drop-off is unforgiving if misjudged.