These are the current US Standards for Motorcycles:
§571.123 Standard No. 123; Motorcycle controls and displays.
S1. Scope. This standard specifies requirements for the location, operation, identification, and illumination of motorcycle controls and displays, and requirements for motorcycle stands and footrests.
S2. Purpose. The purpose of this standard is to minimize accidents caused by operator error in responding to the motoring environment, by standardizing certain motorcycle controls and displays.
S3. Application. This standard applies to motorcycles equipped with handlebars, except for motorcycles that are designed, and sold exclusively for use by law enforcement agencies.
S4. Definitions. Clockwise and counterclockwise mean opposing directions of rotation around the following axes, as applicable.
(a) The operational axis of the ignition control, viewed from in front of the ignition lock opening;
(b) The axis of the right handlebar on which the twist–grip throttle is located, viewed from the end of that handlebar;
(c) The axis perpendicular to the center of the speedometer, viewed from the operator's normal eye position.
[Editor’s Note: The following definition for “scooter†is added effective August 30, 2006.]
Scooter means a motorcycle that:
(1) Has a platform for the operator's feet or has integrated footrests, and
(2) Has a step-through architecture, meaning that the part of the vehicle forward of the operator's seat and between the legs of an operator seated in the riding position, is lower in height than the operator's seat.
S5. Requirements.
S5.1. Each motorcycle shall be equipped with a supplemental engine stop control, located and operable as specified in Table 1.
S5.2 Each motorcycle to which this standard applies shall meet the following requirements:
[Editor’s Note: S5.2.1 is revised effective August 30, 2006.]
S5.2.1 Control location and operation. If any item of equipment listed in Table 1, Column 1, is provided, the control for such item shall be located as specified in Column 2, and operable as specified in Column 3. Each control located on a right handlebar shall be operable by the operator's right hand throughout its full range without removal of the operator's right hand from the throttle. Each control located on a left handlebar shall be operable by the operator's left hand throughout its full range without removal of the operator's left hand from the handgrip. If a motorcycle with an automatic clutch is equipped with a supplemental rear brake control, the control shall be located on the left handlebar. If a motorcycle is equipped with self–proportioning or antilock braking devices utilizing a single control for front and rear brakes, the control shall be located and operable in the same manner as a rear brake control.
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S5.2.2 Display illumination and operation. If an item of equipment listed in Table 2, Column 1, is provided, the display for such item shall be visible to a seated operator under daylight conditions, shall illuminate as specified in Column 2, and shall operate as specified in Column 3.
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S5.2.3 Control and display identification. If an item of equipment in Table 3, Column 1, is provided, the item and its operational function shall be identified by:
(a) A symbol substantially in the form shown in Column 3; or
(b) Wording shown in both Column 2 and Column 4; or
(c) A symbol substantially in the form shown in Column 3 and wording shown in both Column 2 and Column 4.
(d) The abbreviations "M.P.H.", "km/h", "r/min", "Hi", "Lo", "L", "R", and "Res" appearing in Column 2 and Column 4 may be spelled in full. Symbols and words may be provided for equipment items where none are shown in Column 2, Column 3, and Column 4. Any identification provided shall be placed on or adjacent to the control or display position, and shall appear upright to the operator.
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S5.2.4 Stands. A stand shall fold rearward and upward if it contacts the ground when the motorcycle is moving forward.
S5.2.5 Footrests. Footrests shall be provided for each designated seating position. Each footrests for a passenger other than an operator shall fold rearward and upward when not in use.