Specifications

SVI Trucks
Freightliner 4-Door Demo
SVI #917 01/05/15
65
WARNING LIGHT PACKAGE
Each apparatus shall have a system of optical warning devices that meets or exceeds the requirements of this
section.
The optical warning system shall consist of an upper and a lower warning level. The requirements for each level
shall be met by the warning devices in that particular level without consideration of the warning devices in the
other level.
For the purposes of defining and measuring the required optical performance, the upper and lower warning levels
shall be divided into four (4) warning zones. The four zones shall be determined by lines drawn through the
geometric center of the apparatus at 45 degrees to a line drawn lengthwise through the geometric center of the
apparatus. The four (4) zones shall be designated A, B, C, and D in a clockwise direction, with zone A to the front
of the apparatus.
Each optical warning device shall be installed on the apparatus and connected to the apparatus’s electrical
system in accordance with the requirements of this standard and the requirements of the manufacturer of the
device.
A master optical warning system switch that energizes all the optical warning devices shall be provided.
The optical warning system on the fire apparatus shall be capable of two (2) separate signaling modes during
emergency operations. One (1) mode shall signal to drivers and pedestrians that the apparatus is responding to
an emergency and is calling for the right-of-way. One (1) mode shall signal that the apparatus is stopped and is
blocking the right-of-way. The use of some or all of the same warning lights shall be permitted for both modes
provided the other requirements of this chapter are met.
A switching system shall be provided that senses the position of the parking brake or the park position of an
automatic transmission. When the master optical warning system switch is closed and the parking brake is
released or the automatic transmission is not in park, the warning devices signaling the call for the right-of-way
shall be energized. When the master optical warning system switch is closed and the parking brake is on or the
automatic transmission is in park, the warning devices signaling the blockage of the right-of-way shall be
energized. The system shall be permitted to have a method of modifying the two (2) signaling modes.
The optical warning devices shall be constructed or arranged so as to avoid the projection of light, either directly
or through mirrors, into any driving or crew compartment(s). The front optical warning devices shall be placed so
as to maintain the maximum possible separation from the headlights.