92 Ill. Adm. Code 1535.343
Warning Indication
Section 1535
Section 1535.343 Warning
Indication
The lights shall be arranged to
flash alternately, the number of flashes per minute to conform to current AREMA
specifications and AREMA specifications shall constitute the minimum
requirements of this Commission with respect to range and beam intensity of
incandescent lamp and light emitting diode (LED) signals.