About starting in 1946, warning lights, traffic warning lights system started
to install onto the school bus in Virginia. At this time the warning light of
similar car headlights are a pair of devices, installed in the front of the car
and the tail, respectively. Later, the number of warning light increased from
the original four to eight: four amber lights used to remind people before and
after the school bus will stop, four red light means the school bus is in a
state of parking. [8]
Stop signals spiral arms, in the early 1950 s, some states began requiring
set stop signals the arms, at the bus stop, the driver will be located on the
left side of the car body unscrew the brands, to warn others, the school bus is
in a state of parking. "FMVSS" made specific provision: the arm must be double
standard octagonal red STOP sign, its width must be at least 17.7 inches, and
white and white caps are embedded with the words "STOP". The badge must be has
the reverse reflection function or with flashing red lights. Can also, of
course, with the aid of light-emitting diodes (leds), with a capital of the word
"STOP" flashing way instead of the above methods.
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In addition, the law of the installation position of the arms also made
specific provision. It must be put in on the left side of the car body, and at
right angles to the body. Shall, at the same time, the sign on the edge with the
driver after the window's first under the passenger's window frame edge parallel
to each other, the distance between the horizontal tangent with the latter the
former should be controlled within 6 inches; Sign center of vertical distance
from the car body can't more than 9 the huan in addition, the law also
stipulates that shall be installed at the end of the school bus in the spiral
arms of another size, same shape, but its surface is printed with the word
"STOP".
Security doors, American school bus, except on the doors in the rear section
of the car, for at least one passenger evacuation doors used in critical cases,
the door is often called "exit". Different models of course, the number of the
emergency exits there may be differences. Generally, the rest of the "exit" will
be installed at the side of the bus roof, window, car body etc. When there's an
emergency, pull the emergency start bar, all the emergency exit will open
automatically.
Retroreflection tag, many states require the school bus body and the tail
yellow posted back to ray zone, indicating the length, width and height of the
car. In darkness or bad weather, this special material tag, with the help of
other vehicle lighting light will be shining, leading to alert other drivers and
for them to provide conditions for judging correctly the size and location of
the school bus. FMVSS "moreover," article 217 requires all the emergency exit in
the school bus is set retroreflection tag (can be yellow, white or red), thereby
rapidly in the darkness of night for rescue personnel found to save personnel
provide great convenience.
Horizontal arm, because the school bus car is huge, and longer, can keep out
the line of sight of the driver, therefore, when pedestrians, students close to
the front of the school bus, easy to produce risk. Based on this, some state
laws require school bus equipped with horizontal arm. The arm in the process of
student getting on or off from the bus out of the front bumper, can guarantee
pedestrians, so keep a safe distance between students and the school bus.
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