University of Vermont AAHS

Colorado Riding on Public Roads Statute and Regulations



42-4-109. Motorized bicycles, animals, skis, skates, and toy vehicles on highways

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(8) Persons riding or leading animals on or along any highway shall ride or lead such animals on the left side of said highway, facing approaching traffic. This shall not apply to persons driving herds of animals along highways.

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(10) Every person riding or leading an animal or driving any animal-drawn conveyance upon a roadway shall be granted all of the rights and shall be subject to all of the duties applicable to the driver of a vehicle by this article, except those provisions of this article which by their very nature can have no application.
(11) Where suitable bike paths, horseback trails, or other trails have been established on the right-of-way or parallel to and within one-fourth mile of the right-of-way of heavily traveled streets and highways, the department of transportation may, subject to the provisions of section 43-2-135, C.R.S., by resolution or order entered in its minutes, and local authorities may, where suitable bike paths, horseback trails, or other trails have been established on the right-of-way or parallel to it within four hundred fifty feet of the right- of-way of heavily traveled streets, by ordinance, determine and designate, upon the basis of an engineering and traffic investigation, those heavily traveled streets and highways upon which shall be prohibited any bicycle, animal rider, animal-drawn conveyance, or other class or kind of nonmotorized traffic which is found to be incompatible with the normal and safe movement of traffic, and, upon such a determination, the department of transportation or local authority shall erect appropriate official signs giving notice thereof; except that with respect to controlled access highways the provisions of section 42-4-1010(3) shall apply. When such official signs are so erected, no person shall violate any of the instructions contained thereon.
(12) The parent of any child or guardian of any ward shall not authorize or knowingly permit any child or ward to violate any provision of this section.
(13) Any person who violates any provision of this section commits a class B traffic infraction.



204-5. Slow Moving Vehicles 

1. All machinery and equipment, including implements of husbandry, horse drawn vehicles, farm tractors, road machinery, road graders, and every vehicle which has a maximum speed that does not exceed 25 miles per hour or every vehicle capable of speeds in excess of 25 miles per hour but which in its normal operational use is moved at less than 25 miles per hour on the highway, shall display a "Slow Moving Vehicle" emblem complying with the specifications set forth in Section 7 of this regulation.

2. All road construction or maintenance machinery when engaged in actual construction or maintenance work guarded by a flagman or clearly visible warning signs need not display the "Slow Moving Vehicle" emblem.

3. All machinery, equipment and vehicles displaying such Slow Moving Vehicle emblem, when being transported or moved on the highways at speeds in excess of 25 miles per hour, shall have the Slow Moving Vehicle emblem removed or covered when being so moved or transported.

4. Any combination of slow moving vehicles, i.e., tractor-trailers, shall display the "Slow Moving Vehicle" emblem on the rearmost unit of the combination.

5. The Slow Moving Vehicle emblem shall be mounted as near the center as possible on the rear of the vehicle at a height of not less than 2 feet nor more than 6 feet from the ground to the bottom edge of the emblem. Such emblem will be mounted with a point of the triangle at the top and shall be mounted in a plane perpendicular to the direction of travel.

6. The requirements for such emblem shall be in addition to any other lighting devices required by law.

7. Specifications for SLOW MOVING VEHICLE Emblem.

A. Description:

(1) The SLOW MOVING VEHICLE Emblem (Fig. 1) shall consist of a fluorescent yellow-orange triangle with a dark, red reflective border. The yellow-orange fluorescent triangle is for daylight identification. The reflective border defines the shape of the fluorescent color in daylight and becomes a hollow red triangle in the path of motor vehicle headlights at night.

B. Performance Requirements:

(1) Visibility. The emblem shall be entirely visible in daylight and at night from all distances between 600 feet and 100 feet from the rear when directly in front of lawful upper beam of headlamps.

(2) Dimensional requirements. The minimum size shall be as shown in Fig. 1.

(3) Color and reflectivity.

(a) The spectrophotometric color values of the yellow-orange fluorescent material shall have a dominant wave length of 590-610 millimicrons and a purity of 98 percent before use. After Durability Test, paragraph (4), the dominant wave length of the fluorescent material shall not change more than 10 percent.

 (b) The reflective material shall have minimum intensity values at each of the angles listed per Table 1. After Durability Test, paragraph (4), the minimum reflective intensity values for the reflective material shall not change more than 20 percent from the values specified in Table 1.


TABLE 1. Minimum Reflective Intensity Values, R [FN1]


Divergence Angle, deg            Incidence Angle, deg   Reflective Intensity, R


0.2                                                 0                        10

0.2                                                15                         7

0.2                                                30                         5

0.5                                                .0                         5

0.5                                                15                         4

0.5                                                30                         2


FN1. Measurements shall be conducted in accordance with photometric testing procedures for reflex-reflectors as specified in Society of Automotive Engineers Standard, SAE J594, Reflex Reflectors, and using 50, +-3 sq. in. (322.6, +- 32.3 sq. centimers) of reflective material. The maximum dimension of the test surface shall not be greater than 1.5 times the minimum dimension. The Reflective Intensity (R) is computed from the equation.


(Lr) (d super2 )

R  =  ----------------

      (Ls) (A)


R     =  reflective intensity, candlepower per incident foot-candle per square foot

Lr    =  illumination incident upon receiver at observation point, foot-candles

Ls    =  illumination incident upon a plane perpendicular to the incident ray at the test specimen position, foot-candles

d     =  distance from test specimen to source of elimination (100 feet as specified in SAE J594), feet

 A     =  area of test surface, square feet

 (4) Durability

 (a) The reflective and fluorescent materials shall be tough, flexible and of sufficient thickness and strength to meet the requirements of sections B and C. After the Durability test, paragraph (4), the fluorescent and reflective material shall show no appreciable discoloration, cracking, crazing, blistering, loss of durable bond, or dimensional change.

 (b) Backing material for portable identification emblem shall be equivalent to 0.040 in. minimum thickness aluminum, 22-gauge minimum thickness mill- galvanized or coated sheet steel with the surface clean and receptive to a durable bond. The backing material shall be free of burrs.

 NOTE: These requirements are minimal and do not preclude the use of materials having superior performance.

C. Test Procedures:

(1) The emblem shall be tested in conformance with the following sections from SAE J575, Test for Motor Vehicle Lighting Devices and Components:

  Section B - Samples for test

  Section D - Laboratory Facilities

  Section E - Vibration Test

  Section H - Corrosion Test (pertains to face of emblem only)

(2) Durability Test. Samples shall be exposed to the sun at an angle of 45 deg to horizontal and facing south per American Society for Testing and Materials, ASTM D1014, Method of Conducting Exterior Exposure Tests of Paints on Steel.


TABLE 2. Durability Test Periods


                           Minimum Test Period, months


Location                      Fluorescent  Reflective


Outside in Midwest                     12  24


Outside in Miami, Florida               6  12


(3) Drop Test. Each test sample shall be dropped from a height of 5 feet (1.53 m) to a smooth hard surface equivalent to rigid metal or concrete. Each test sample shall be submitted to three drop tests: corner drop, edge drop, and flat drop. Failure shall be considered to have occurred when the emblem will no longer meet requirements in Section B.

8. All "Slow Moving Vehicle" emblems must be approved for use and sale in the State of Colorado by the Department of Revenue. Such approval shall be accomplished through the A.A.M.V.A. Equipment Approval Section, Washington, D. C.

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