Question

which device/sign can be used to warn you a train is coming? select all that apply the railroad crossing safety officer flashing red lights a ringing bell a lowering gate

Explanation:

At railroad crossings, flashing red lights, a ringing bell, and a lowering gate are common warning devices to alert people of an approaching train. A railroad - crossing safety officer is a person, not a device.

Answer:

B. flashing red lights, C. a ringing bell, D. a lowering gate