Interpretation ID: nht95-4.78

TYPE: INTERPRETATION-NHTSA

DATE: November 16, 1995

FROM: Kenneth W. Easterling -- Plan B Engineering, Inc.

TO: Taylor Vinson -- NHTSA; Samuel J. Dubbin -- Chief Counsel, NHTSA

TITLE: Collision Avoidance Technology

ATTACHMT: 12/22/95 letter from Samuel J. Dubbin to Kenneth Easterling (A43; Std. 108); 7/30/93 letter from John Womack to Wayne Ferguson

TEXT: THANK YOU FOR TAKING TIME TO DISCUSS THE DEVELOPMENTS MADE RECENTLY OUR COLLISION AVOIDANCE DEVICE NOW IN THE FINAL DESIGN STAGES. AS PER YOUR DIRECTIVE. I HAVE ATTACHED A BRIEF SYNOPSIS OF THE SUBJECT DEVICE FOR YOUR CONSIDERATION AND OPINION.

IF I CAN PROVIDE ANYTHING FURTHER IN TERMS OF PRODUCT ILLUSTRATION OR EXPLANATION, PLEASE GIVE ME A CALL.

WE SINCERELY THANK YOU IN ADVANCE FOR YOUR PERSONAL COMMENTARY AND SUBMISSION TO MR. DUBBIN'S OFFICE FOR INSPECTION.

VERY BEST REGARDS, KENNETH W. EASTERLING

Attachment

Mr. Samuel J. Dubbin Chief Counsel NHTSA, Room 5219

Subject: Rear End Collision Avoidance Re: Proportional Deceleration Indicator Lamps (aka) G-Lamps

Dear Mr. Dubbin:

In recognition of the significant work and contributions to highway safety, I submit for your consideration and opinion, the concept and justification for G-Lamps.

To be specific, an inertial driven, proportional deceleration indicator lamp as an intended enhancement to existing single filament, on/off style incandescent brake lamps. We have recently entered final design stages on the device and initial tests h ave revealed some startling results in decreased driver reaction times when compared to the industry standard products.

Building on my work experience within the California Highway Patrol, I recognized the need for motorists to be aware of not only when a vehicle ahead of you was braking, but to what degree the deceleration was be made. Tests have shown reaction times were cut in half when a motorist was visually appraised of increasing, hard braking activity instead of having to judge the rate of diminishing distance between his/her vehicle and the braking motorist (as is the case with on/off style brake lamps). In the case of freeway speeds, these reaction times and distances are accumulated from one vehicle to the next (rear) until ultimately (at freeway speeds) a rear end collision is imminent.

G-Lamps was developed to provide motorists to the rear, visual reference to the degree of braking activity on a real-time basis. Valuable distance is directly proportionate to time lost in reacting to sudden stops or increasingly harder braking. As we all know, there exists a tendency to "ride" our brakes when anticipating slow-downs or stops. This has effectively eliminated the benefits of standard brake lamps. From the time of activation, the degree of braking activity is anyone's guess. To mo torists to the rear it may very well end up in excessive vehicle damage and injury liabilities.

For your inspection, explanation of the device is delivered on the following pages. I have tried to be as informative as possible without laboring you with manufacturing details that would rival a sales pitch.

I thank you in advance for your input and contributions to this effort.

Kenneth Easterling, President, Plan B Engineering Inc.

Intent and Purpose

The device was conceived to counter the hazards of hard braking while in traffic at highway speeds. It is intended to enhance existing brake indicator lamp systems and not to deviate from customary and expected visual queues during motor vehicle oper ation with one important exception.

Specifically, braking activity in excess of normal deceleration (defined as an appreciable decay of forward momentum of the vehicle) would activate decelerometer circuitry housed within the lamp bulb itself and be viewed from the rear as proportionate ly faster flashing light equating to the degree of deceleration. Normal braking would display customary visual queues as a steady burn of the brake lamp.

It is well established through independent studies and government testing, driver reaction times are severely compromised as the distance between vehicles decrease under various breaking conditions. This scenario is aggravated by the need to visually judge the rate of deceleration of the stopping vehicle and a following driver to respond accordingly.

The device proposed will deliver visual feed-back to following motorists of greater than normal braking activity. The ergonomics of the device are geared to normal reflex actions of potential and proportion. The greater the rate of deceleration of t he vehicle the faster the cycles per second of the inertial lamp. Therefore, the following vehicle's response will be to react with potentially greater braking activity much sooner than normal. Thus capturing valuable stopping distance that would other wise be lost. This problem is further exaggerated by less than desirable visual acuity present in more than three quarters of the motoring public.

Abstract of Device (i.e. form, fit and function) While the form and fit of the device mimic the present day designs for incandescent, filament style lamps, the similarity must end there. Unlike it's predecessor, the inertia lamp is mechanically dynamic in function. To operate the device must be sub jected to substantial negative G-forces which can only be generated by the sudden and rapid deceleration the vehicle in which it is mounted. Without these influences, the bulb assembly acts as any other lamp bulb, in terms of constant steady burn associ ated with normal deceleration rate, when the brake system is activated.

By nature of design, the inertia bulb will activate in concert with the steady burning "normal" brake lamp. Once energized, the inertia flash filament portion of the lamp will increase the flash rate by cycles per second (Hz) proportionate to the rat e of declaration. This is a desired means of attaining a quantification of braking magnitude.

Microelectronics technology allows the timing circuitry to be housed within a standard "bayonet" style socket with no modification to the manufacturer's electrical or molded lens structures. State of the art manufacturing techniques allow the device to be fabricated in cost ranges considered to be competitive with existing high performance lamps. The solid state design and minimal parts involved insure long life and serviceability.

Summary

In conclusion, our studies indicate this device to be the most straight forward, technically viable and ergonomically effective means of reducing the single most prolific cause of vehicular collisions today, "the rear-ender". Billions of dollars annua lly are paid out by insurance companies for damages and bodily injury claims directly related to these types of collisions. Considering the enormous loss in work time, productivity in the economy and personal pain and suffering, the numbers are staggeri ng.

Recently a precedence was set by General Motors with the introduction of the Daytime Running Lamp. Recognizing a simple but highly effective means of vehicular illumination, a major, profit oriented corporation was willing to make a billion dollar in vestment to highway safety. The motoring public as well as the companies that insure their financial responsibility, have come to expect a product that is as safe as technically and morally possible.