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Why only left hand turn signal, left hand mirror?

HappyHighwayman

It's all in the reflexes
Joined
Apr 8, 2009
Location
San Francisco
Moto(s)
Rad Rover
Name
Jordan
I note that on some chopper/bobbers or stripped down street bikes they feature only a LEFT hand turn signal and a LEFT side mirror. I've seen this on some sports cars too (only left mirror).

A girl in my MSF class rode a 1965 Honda that had NO turn signals or mirros at all...is this even street legal?

I assume on a car, as you're sitting front left, it could make sense that one side of the car has a larger blind spot than the other, but on a motorcycle it doesn't seem to make sense. I'd rather not have to use hand signals on a moto.
 
Up until 1969 or so, few motorcycles had turn signals, and I think it was even later than that, that they were required by law. Older vehicles are granfathered out of equipment regulations that were written after they were made.

I have no idea why any bike would only have a left hand turn signal, other than maybe the owner dropped it a few too many times on the right side, and quit replacing it.

Left hand mirrors only are common on older bikes, and a lot of chopper builders only put on a left hand mirror.
None of my vintage bikes (all 1970 or older) have two mirrors, and none of them have turn signals (well, none that are running; I do have a 1975 Kawasaki triple basket case that has signals).
 
Personally, I haven't seen the left-signal-only bikes. One mirror, yeah. It seems I recall that bikes from 1973-up are required to have turn signals; older ones aren't.
 
I've seen only left-hand mirror bikes. I know guys who track out their bikes, and they'll leave on just a bar-end left mirror to meet the legal requirement (of one mirror).

No idea on the turn signal aspect.
 
Unsure about signals but as for mirrors I figure this.
When you merge right, you are catching traffic, and all the action is in front of you.
When you merge left traffic is catching you, and all the action is behind you, hence a mirror.
 
No idea about the signal but I run only a left side bar end mirror for three reasons.

1: The throttle side is harder to attach as the mirror rubs on the end of the grip, making the throttle stick.

2: It looks badass IMHO.

3: I only use it to look behind me, and only one is necessary for that, I always use a head turn or just plain situational awareness to see what is on the sides of me.
 
1: The throttle side is harder to attach as the mirror rubs on the end of the grip, making the throttle stick.

2: It looks badass IMHO.

3: I only use it to look behind me, and only one is necessary for that, I always use a head turn or just plain situational awareness to see what is on the sides of me.
QFT

nodrag_01.jpg


I think that having the lone mirror on the left of a bike is habit/tradition carried over from cars, since cars are required to have at least a left side mirror (right side and center rear view are optional).
 
QFT

nodrag_01.jpg


I think that having the lone mirror on the left of a bike is habit/tradition carried over from cars, since cars are required to have at least a left side mirror (right side and center rear view are optional).

QFT = quoted for truth?
 
California laws regarding mirrors and turn signals for cars and motorcycles

Cars law

Mirrors

26709. (a) Every motor vehicle registered in a foreign jurisdiction and every motorcycle subject to registration in this state shall be equipped with a mirror so located as to reflect to the driver a view of the highway for a distance of at least 200 feet to the rear of such vehicle.

Every motor vehicle subject to registration in this state, except a motorcycle, shall be equipped with not less than two such mirrors, including one affixed to the left-hand side.

(b) The following described types of motor vehicles, of a type subject to registration, shall be equipped with mirrors on both the left-and right-hand sides of the vehicle so located as to reflect to the driver a view of the highway through each mirror for a distance of at least 200 feet to the rear of such vehicle:

(1) A motor vehicle so constructed or loaded as to obstruct the driver's view to the rear.

(2) A motor vehicle towing a vehicle and the towed vehicle or load thereon obstructs the driver's view to the rear.

(3) A bus or trolley coach.

(c) The provisions of subdivision (b) shall not apply to a passenger vehicle when the load obstructing the driver's view consists of passengers.
Amended Ch. 74, Stats. 1970. Effective November 23, 1970.

Motorcycle law

Motorized Bicycle: Safety and Equipment Requirements

24015. (a) Motorized bicycles shall comply with those federal motor vehicle safety standards established under the National Traffic and Motor Vehicle Safety Act of 1966 (15 U.S.C., Sec. 1381, et seq.) which are applicable to a motor-driven cycle, as that term is defined in such federal standards. Such standards include, but are not limited to, provisions requiring a headlamp, taillamp, stoplamp, side and rear reflex reflectors, and adequate brakes.

(b) In addition to equipment required in subdivision (a), all motorized bicycles operated upon a highway shall be equipped with a mirror as required in subdivision (a) of Section 26709, a horn as required in Section 27000, and an adequate muffler as required in subdivision (a) of Section 27150.

(c) Except as provided in subdivisions (a) and (b), none of the provisions of this chapter relating to motorcycles and motor-driven cycles, as defined in this code, shall apply to a motorized bicycle.
Amended Ch. 421, Stats. 1978. Effective January 1, 1979.

A neat fact, the law does not state what side the mirror has to be on for a motorcycle

Turn signal law
Turn Signal System

24951. (a) Any vehicle may be equipped with a lamp-type turn signal system capable of clearly indicating any intention to turn either to the right or to the left.

(b) The following vehicles shall be equipped with a lamp-type turn signal system meeting the requirements of this chapter.

(1) Motor trucks, truck tractors, buses and passenger vehicles, other than motorcycles, manufactured and first registered on or after January 1, 1958.

(2) Trailers and semitrailers manufactured and first registered between December 31, 1957, and January 1, 1969, having a gross weight of 6,000 pounds or more.

(3) Trailers and semitrailers 80 or more inches in width manufactured on or after January 1, 1969.

(4) Motorcycles manufactured and first registered on or after January 1, 1973, except motor-driven cycles whose speed attainable in one mile is 30 miles per hour or less.

The requirements of this subdivision shall not apply to special mobile equipment, or auxiliary dollies.

(c) Turn signal lamps on vehicles manufactured on or after January 1, 1969, shall be mounted not lower than 15 inches.
Amended Ch. 475, Stats. 1975. Effective January 1, 1976.
 
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