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An active railroad crossing

A Has a traffic control device installed at the crossing
Explaination
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.
B Does not have any traffic control devices installed at the crossing
C Is characterized by having at least 10 vehicles cross the tracks every hour
D Should be avoided