Name:	Highway Grade Crossing Approach Sign.
Indication:	Approach to highway grade crossings for which whistle must be sounded or bell rung as per Rule 30.
NOTE: When this sign indicates approach to more than one crossingit is supplemented with a disk displaying a numeral indication the number of crossings.
Name:	Trackman's Portable Whistle Sign
Indication:	Sound whistle to warn workmen on or near track (Rule 30).