Interpretation ID: nht78-2.22

DATE: 04/06/78

FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA

TO: Illinois Department of Transportation

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of September 22, 1977, to the Administrator asking whether an Illinois standard applicable to school bus lighting is neither preempted by nor violates Federal Motor Vehicle Safety Standard No. 108, Lamps, Reflective Devices, and Associated Equipment.

Paragraph S4.1.4(b) (ii) of Standard No. 108 requires that:

"The [school bus signal lamp] system shall be wired so that the amber signal lamps are activated only by manual or foot operation and, if activated, are automatically deactivated and the red signal lamps automatically activated when the bus entrance door is opened."

Under the Illinois requirement (4.2.18.2) the amber signal lamps appear to be activated only by manual or foot control (4.2.18.2 (d)), and are automatically deactivated when the bus entrance door is opened (4.2.18.2 (e) and (f)). The red signal lamps are activated before the bus entrance door is opened (4.2.18.2 (e)) and remain activated when the door is opened (4.2.18.2 (f)). Thus, these portions of the Illinois requirement comply with Standard No. 108.

As for the remaining portions of 4.2.18.2, they dictate sequential operational requirements of the 8-lamp system and stop arm (an item of equipment not required by Standard No. 108). To accomplish this operation, 4.2.18.2 requires that "A separate circuit breaker and a master switch shall be provided for this signal system." You have asked whether this is preempted by Standard No. 108.

The aspect of performance involved here is that of wiring requirements for school bus warning lamps. Standard No. 108 specifies the manner in which these lamps shall operate but it is silent as to the ways this performance shall be achieved. Therefore Illinois is not preempted from requiring a separate circuit breaker and master cylinder in school bus lighting systems, a specification which is one of good engineering practice and probably used as a matter of course by most school bus manufacturers.

SINCERELY,

Illinois Department of Transportation

September 22, 1977

Joan Claybrook, Administrator National Highway Traffic Safety Administration

Dear Ms. Claybrook:

In this letter, I ask you to advise that the Illinois safety standard for school bus alternately flashing signal lamps does not violate Federal Motor Vehicle Safety Standard 108. I also ask that you advise this Illinois standard is not preempted under provisions of the National Traffic and Motor Vehicle Safety Act of 1966 (PL 89-563). We are asking for these statements because a representative of one school bus manufacturer has stated the Illinois standard violates a portion of FMVSS 108, as interpreted by his company.

Before going into details, I will present some background information.

School buses are defacto mobile traffic control devices. To lessen confusion and earn public respect and compliance, their signals must be displayed in a consistent and reasonable manner.

When a conventional traffic signal at an intersection changes to yellow (amber) some drivers will decelerate and stop; others will continue or will accelerate (if traffic permits), attempting to enter the intersection before the signal changes to red. Drivers usually react the same way to yellow alternately flashing school bus signal lamps -- some slow down; some continue or speed up. In addition, some drivers tend to disobey the red school bus signals even though they might tend to obey red traffic signals at intersections.

Exuberant and impulsive pupils rushing out of a school bus are likely to dash into a roadway -- without checking whether all vehicles have stopped.

Under very cold, inclement, or severe weather conditions, many pupils tend to remain in their homes or other shelter until the school bus arrives.

Police have reported that school bus drivers tend to keep the service door closed while waiting in cold, inclement, or severe weather, opening the door as each pupil arrives. This is done to prevent loss of heat and/or entrance of snow, sleet, or rain. (This tendency was mentioned in the 2nd paragraph on page 4 of "ILLINOIS COMMENT ON PROPOSED TRAFFIC SAFETY PROGRAM STANDARD 17, PUPIL AND YOUTH TRANSPORTATION SAFETY -- DRAFT OF JUNE 30, 1970, VERSION A" which was submitted 9-30-70 in response to Traffic Safety Program Letter 42-11, dated 6-30-70.)

Studies show a significant portion of school bus related pupil fatalities and injuries in Illinois occur while the pupil is a pedestrian.

A copy of "ILLINOIS MINIMUM SAFETY STANDARDS FOR TYPE 1 SCHOOL BUSES", effective July 1, 1977, a copy of Section 12-812 of the Illinois Vehicle Code (referred to therein), and a transmitting memorandum are enclosed. Please note that these Standards apply to every Type 1 school bus procured for use in Illinois. Also, the FMVSS applicable to buses are included by reference (1.2, 4.1, & 5.1). This inclusion eliminates doubts about state and local agencies with enforcement powers having authority to enforce those FMVSS.

The Illinois standard for school bus alternately flashing signal lamps is set forth at 4.2.18.2 on pages 15 and 16 of the enclosed Standards. The prescribed sequence of operations, (a) through (j), describes operations on a typical Type 1 school bus equipped with a manual service door operating mechanism, in which a signal control switch (or switches) is operated by movement of the door control handle. Of course, each of the described operations is not used deliberately by the school bus driver at every stop.

The "master switch" is moved to "off" only when complying with statutory and administrative requirements (upper portion of page 15).

After stopping on a clear roadway to load or unload pupils, the school bus driver might move the door control handle from its "secured" or "travel" position to its "door-fully-open" position in one rapid and continuous movement. In this case Operation (e) is of very short duration but, still, the signal switch(es) acts to deactivate and activate the yellow and red signals before the service door is opened.

After discharging or loading pupils, the driver might move the door control handle from its "door-fully-open" position to its "secured" or "travel" position in one rapid, continuous movement. In this case Operation (g) is of very short duration, Operation (i) is bypassed, and Operation (j) is completed. But, still, the door is closed before the signal switch(es) acts to extinguish the red signals.

There are many stops, however, where Operations (e) and (f) and/or Operations (g) and (h) are important to pupil safety, orderly traffic movement, and traffic safety.

When a school bus driver reaches a stop where other vehicles are moving on the roadway, Operation (e) allows him to hold exuberant and impulsive pupils in the bus by keeping the service door closed until all other vehicles have stopped in response to display of the red alternately flashing signal lamps. With the manual service door control, he does this by moving the door control handle, or lever, only a short distance from its "secured" or "travel" position, but not far enough to open the service door. After all other vehicles have stopped, the bus driver can use Operation (f) and allow pupils to leave the bus. Without either Operation (e) or its equivalent, which usually has not been provided with power operated doors, the school bus driver must open the service door to activate the red signals, and thereby, discharge exuberant and impulsive pupils onto the roadway before all drivers of moving vehicles react to the signal change from yellow to red.

Operation (e) also allows a school bus driver to prevent loss of heat and/or the entrance of snow, sleet, or rain during very cold or severe weather conditions by keeping the service door closed while pupils dash from their home or other shelter to the stopped, red-signalling bus.

When a school bus driver has stopped and admitted a pupil, Operation (g) allows him to maintain display of red signals without losing heat or allowing entrance of snow, sleet, or rain while waiting for the arrival of other pupil(s) during cold or severe weather. With a manual service door, he does this by moving the door control handle, or lever, far enough to close the door but not far enough to extinguish the red signals (which happens when the control is moved to its "secured" or "travel" position). With signal controls arranged as they often are on power operated service doors, closing of the door prevents display of the red signals and other vehicles move. This endangers pupils as they arrive at the school bus. When alternate opening and closing of such a door causes intermittent operation of the red signals, drivers of other vehicles become confused or frustrated and tend to lose respect for the special school bus signals.

The sequence of operations prescribed in 4.1.18.2(a) through-(j) (including ability to "skip through" Operations (e) and (g) and to "bypass" Operations (f) and (h), as desired) is either inherent in or easily provided with nearly every manually operated service door control device on Type 1 school buses. However, many power operated service door control devices in use and being manufactured do not provide for such a sequence of operations -- particularly Operations (e) and (f) and Operations (g) and (h). In the past, a typical power door has been either fully-closed-and-secured or fully-opened, with the signals controlled by those conditions and with no provision for intermediate conditions and/or Operations (e) and (g).

We have been requested to change the Illinois Standard (4.2.18.2) so as to accommodate typical power operated door mechanisms and controls as they have been designed and manufactured in the past. We have responded by stating the required sequence of signal operations must be provided whether the service door is manual or power operated and have interpreted the standard so as to ease certain apparent requirements in 4.2.18.2(e) and 4.2.18.2(g). The enclosed letter dated September 15, 1977, was sent to each school bus manufacturer.

Conditions causing traffic hazards or confusion should not be perpetuated merely to accommodate the traditional designs of a convenience such as a power operated service entrance door -- whether the bus is procured by the State, a local government, a public school district, or a religious or private organization or person. School buses that conform to the Illinois standard for alternately flashing school bus signal lamps (4.2.18.2) will provide for lessening or preventing dangers to pupils in roadways near stopped buses.

It seems clear that such buses conform to S4.1.4(b)(ii) in FMVSS 108. On such buses the yellow (amber) signals are activated only by manual or foot operation and, if activated, are automatically deactivated and the red signals automatically activated when the bus service entrance door is opened.

It seems clear that the Illinois Standard (4.2.18.2) is not preempted by FMVSS 108 under provisions of Section 103(d) of the National Traffic and Motor Vehicle Safety Act of 1966 (PL 89-563). The Illinois requirements for a separate circuit breaker and a "master switch" and for controls that provide Operations (e) and (f) and Operations (g) and (h) apply to each Type 1 school bus procured by a person, organization, or government in Illinois. They are prescribed to govern aspects and provide safety not governed or provided by FMVSS 108.

Will you please affirm that:

The Illinois standard (4.2.18.2) for school bus alternately flashing signal lamps does not violate Federal Motor Vehicle Safety Standard 108; and The Illinois standard (4.2.18.2) for school bus alternately flashing signal lamps is not preempted by Federal Motor Vehicle Safety Standard 108.

Karsten J. Vieg Governor's Representative for Highway Safety