An active railroad crossing:

Question

Active railroad crossings use installed traffic control devices to regulate traffic. These devices can be in the form of flashing red lights, warning bells, and/or gates. The directions of devices controlling railroad crossings must always be followed.

Accepted Answer

Has a traffic control device installed at the crossing.

Answer

Does not have any traffic control devices installed at the crossing.

Answer

Is characterized by having at least 10 vehicles cross the tracks every hour.

Answer

Should be avoided.