92 Ill. Adm. Code 1535.360
Gates
Section 1535
Section 1535.360 Gates
a) Section 1535.335(a) relating to the location of flashing light
signals shall apply in locating crossing gates whether such gates are installed
in conjunction with flashing light signals or independently. In general gate
arms shall extend at right angles to the highway when in lowered position.
b) Gates hereafter installed shall conform, as to aspect and
design, with current signal specifications of AREMA.
c) Gates arms shall be striped diagonally in red and white and
shall be kept reasonably clean so as to be readily observable.
d) Three red lights shall be mounted upon each roadway gate arm
in such manner as to give an indication in both directions along the highway at
all times when gates are in the lowered position and when they are being raised
and lowered. The red lights shall be of such brilliancy as to give indication
to highway traffic when at a reasonable distance from the crossing. When
lighted, the red light unit nearest the tip of the gate arm is to be steady
burning and the other two lights shall flash alternately in unison with the
flashing light signals. The three lamp units shall be operated together with
the flashing light signals in such manner as to give reasonable advance warning
to highway traffic of the lowering of gate arms.