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Rear View Mirror/Camera Combo?
Been thinking of how to meet the intent of various state requirements for
outside rear view mirrors. The person credited with inventing the rear view mirror is a man named Ray Harroun, an engineer with Marmon, then a car maker. Harroun inserted a mirror in his car, a Marmon Wasp... Ray's invention took place in the spring of 1911. Who Invented the Rear View Mirror? http://www.rumbledrome.com/images/wasp.jpg That car is an ecomodder's dream: boat tail, disc wheels... :p In every state mirrors are required to provide a view to 200 ft. behind the vehicle. On the surface, that's fine, but it's nearly meaningless. About all it seems to mean is the mirror has to be shiny. Whether or not an object can be seen at 200 ft. is more a function of alignment. Nothing is said about the area or angular sweep that must be viewable. (The fly in the ointment. Of all the states, only Vermont specifies the area for the required mirror; not less than 5" diameter or less than 25 sq. in. Surely the legislators in VT know that a 5" diameter circle has an area of 19.6 sq. in. Mirror Laws by State (U.S.) - EcoModder Regulations that require a certain specific thing are old school. In the case of rear view mirrors, when the regulation was first implemented, a reflecting mirror was the only way to get the desired rear-ward view. A more modern and enlightened method of regulation is to specify the desired outcome, and let the industry/market/research provide ways to achieve it. This sort of regulation is performance based and allows for innovation. Like it or not, all state rear view regs are firmly mired in the past. :mad: So, in thinking about a mirror delete, why not meet the regs half-way. Why not a mirror, a very small one, say 1 in. diameter, and have the mirror reflect into a web cam which shows the view on a smallish flat screen inside the car. It seems like the combined mirror/camera could be be incorporated in an aerodynamic package/pod ~1-1/2 in in diameter and perhaps 4 in. long. Of necessity, the mirror would have to be visible to a patrol officer on close inspection. Somewhere to start, although I think a larger display screen is in order: Ant Racing Rear View Camera System - Tobefast I wish that were technically competent enough to put something like this together and see how it would be received by the local boys-in-blue. |
The safety inspectors in my area are interpreting the Mass rules anyway to mean "stock" mirrors. So I had to remount the stock mirrors to get an inspection sticker; and then remount my video mirrors. :(
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While I had my camera mirrors installed, I was never once pulled over by police, even in 9 states I drove through with it like that. I'm not sure what the inspection people would say, however. For the most part, they just want to get it over with and don't want a fuss, and keeping to the word of the law is the easiest way.
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Rear View Mirror/Camera Combo; Legal in 49 States?
FWIW, I think that US DOT/NHTSA regulations provide guidance for vehicle
manufacturers and after-market parts makers. State regulations are enforced on vehicle drivers/operators. In case you've been wondering, :rolleyes: here's what US DOT/NHTSA have to say, there are field of view requirements in S5.2.1: (Current rear view camera proposal not included.) Nat’l Highway Traffic Safety Admin., DOT §571.111 §571.111 Standard No. 111; Rearview mirrors. S1. Scope. This standard specifies requirements for the performance and location of rearview mirrors. S2. Purpose. The purpose of this standard is to reduce the number of deaths and injuries that occur when the driver of a motor vehicle does not have a clear and reasonably unobstructed view to the rear. S3. Application. This standard applies to passenger cars, multipurpose pas- senger vehicles, trucks, buses, schoolbuses and motorcycles. S4. Definitions. Convex mirror means a mirror having a curved reflective surface whose shape is the same as that of the exterior surface of a section of a sphere. Effective mirror surface means the portions of a mirror that reflect images, excluding the mirror rim or mounting brackets. Unit magnification mirror means a plane or flat mirror with a reflective surface through which the angular height and width of the image of an ob- ject is equal to the angular height and width of the object when viewed di- rectly at the same distance except for flaws that do not exceed normal manu- facturing tolerances. For the purposes of this regulation a prismatic day- night adjustment rearview mirror one of whose positions provides unit mag- nification is considered a unit magnification mirror. S5. Requirements for passenger cars. S5.1 Inside rearview mirror. [Not Applicable in this discussion.] S5.2 Outside rearview mirror—driver’s side. S5.2.1 Field of view. Each passenger car shall have an outside mirror of unit magnification. The mirror shall provide the driver a view of a level road surface extending to the horizon from a line, perpendicular to a longitudinal plane tangent to the driver’s side of the vehicle at the widest point, extending 2.4 m out from the tangent plane 10.7 m behind the driver’s eyes, with the seat in the rearmost position. The line of sight may be partially obscured by rear body or fender contours. The location of the driver’s eye reference points shall be those established in Motor Vehicle Safety Standard No. 104 (§571.104) or a nominal location appropriate for any 95th percentile male driver. S5.2.2 Mounting. The mirror mounting shall provide a stable support for the mirror, and neither the mirror nor the mounting shall protrude farther than the widest part of the vehicle body except to the extent necessary to produce a field of view meeting or exceeding the requirements of S5.2.1. The mirror shall not be obscured by the unwiped portion of the windshield, and shall be adjustable by tilting in both horizontal and vertical directions from the driver’s seated position. The mirror and mounting shall be free of sharp points or edges that could contribute to pedestrian injury. S5.3 Outside rearview mirror passenger’s side. Each passenger car whose inside rearview mirror does not meet the field of view requirements of S5.1.1 shall have an outside mirror of unit magnification or a convex mirror in- stalled on the passenger’s side. The mirror mounting shall provide a stable support and be free of sharp points or edges that could contribute to pedes- trian injury. The mirror need not be adjustable from the driver’s seat but shall be capable of adjustment by tilting in both horizontal and vertical directions. S5.4 Convex mirror requirements. Each motor vehicle using a convex mirror to meet the requirements of S5.3 shall comply with the following requirements: S5.4.1 When each convex mirror is tested in accordance with the proce- dures specified in S12. of this standard, none of the radii of curvature readings shall deviate from the average radius of curvature by more than plus or minus 12.5 percent. S5.4.2 Each convex mirror shall have permanently and indelibly marked at the lower edge of the mirror’s reflective surface, in letters not less than 4.8 mm nor more than 6.4 mm high the words ‘‘Objects in Mirror Are Closer Than They Appear.’’ S5.4.3 The average radius of curvature of each such mirror, as determined by using the procedure in S12., shall be not less than 889 mm and not more than 1,651 mm. http://edocket.access.gpo.gov/cfr_20...cfr571.111.pdf |
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