California Code of Regulations › Title 8 - Industrial Relations › Division 1 - Department of Industrial Relations › Chapter 4 - Division of Industrial Safety › Subchapter 4 - Construction Safety Orders › Article 10 - Haulage and Earth Moving › Appendix A - to Section 1591

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
Visibility Test Procedures (Non-Mandatory)
A. General Requirements.
1. Scope and Application. These test procedures may be
						used to determine compliance with Section
						1591(m)(5).
2. Definitions.
a) Exhaust Retrofit. An emission control device installed
						on a vehicle after the vehicle's manufacture, including, but not limited to,
						modified or added sections of exhaust pipe that connect the emission control
						device to the engine. For the purpose of these test procedures, an exhaust
						retrofit does not include an exhaust stack. A modification or addition made to
						a vehicle to install an exhaust retrofit, such as an expanded engine
						compartment hood or added heat shield, shall be considered part of an exhaust
						retrofit.
3. All sections of the exhaust retrofit shall be
						evaluated in accordance with the test procedures in Section B. A retrofit
						passes the visibility test if all sections of the retrofit meet the criteria
						for passing the visibility test in subsections B.1.b or B.2.d. It is not
						necessary for all sections of the exhaust retrofit to pass the same test
						criteria, but all sections must pass at least one of the test criteria.
B. Visibility Test Procedures and Criteria.
1. Determine which sections of an exhaust retrofit are
						inside the Original Equipment Manufacturer (OEM) engine compartment as
						follows:
a) Determine the location of the retrofit section with
						respect to the OEM engine compartment.
b) The retrofit section passes the visibility test if the
						section is located inside the boundary of the OEM engine compartment.
2. Evaluate retrofit sections outside the OEM engine
						compartment as follows:
a) Position the vehicle as instructed in Section
						D.
b) Draw a rectangular boundary line on the ground 40
						inches outside of the smallest rectangle that encompasses the perimeter of the
						vehicle. If a bucket or blade is attached to a vehicle, it shall be placed in
						the traveling position and shall be considered a part of the vehicle when
						drawing the boundary line to the front and rear of the vehicle, but not to the
						sides.
c) Position a camera as instructed in Section G and
						photograph the exhaust retrofit from the driver's view.
d) The retrofit section passes the visibility test if
						photographs taken in accordance with subsection B.2.c. demonstrate that it
						meets one of the following test criteria:
(i) The retrofit section is below the driver's view to
						the edge of the vehicle (see Figure 1), or
(ii) The retrofit section does not block the driver's
						view of the rectangular boundary line drawn according to subsection
						B.2.b.
C. Test Records.
1. Create a written record for each vehicle that passes
						the visibility test, unless all sections of the exhaust retrofit(s) are inside
						the OEM engine compartment. The record shall include the following
						information:
a) Type of vehicle, manufacturer, and model
						number;
b) Vehicle identification number;
c) Manufacturer and model of the exhaust retrofit;
d) The picture(s) demonstrating that the exhaust retrofit
						passes the visibility test criteria;
e) A statement to the effect that the vehicle was
						evaluated in accordance with the visibility test procedures and met the
						requirements for passing the test;
f) The printed name and signature of the person
						conducting the visibility test along with that person's contact information;
						and
g) The test date.
D. Vehicle Position.
1. Park the vehicle on an area of compacted earth or
						paved surface with a gradient of no more than 3% in any direction.
2. Turn off the vehicle engine, set the parking brake,
						and block the tires. Position attachments, such as buckets and blades, in the
						traveling position and block them in place. The bucket or blade may be lowered
						to the ground instead of being blocked in the traveling position, provided that
						this lowered position does not affect the visibility test results.
E. Seat Reference Point.
1. Locate and mark the seat reference point, as
						follows:
a) If the seat pan has a tilt feature, adjust the seat
						pan so that it is as level as possible.
b) If the seat can be adjusted forward and backward,
						adjust the seat so that it is midway between the maximum forward and maximum
						rearward position.
c) If the seat height can be adjusted, adjust the seat
						height so that it is midway between the minimum and maximum height.
d) If the compression of the seat cushion is adjustable
						(air suspension seats), adjust the seat compression so that it is midway
						between its maximum and minimum range.
e) Use a carpenter's square to locate the seat reference
						point, as follows (see Figure 2):
(i) Rest the edge of one arm of the carpenter's square on
						the seat cushion such that it is level and bisects the seat from left to
						right.
(ii) Position the other arm of the carpenter's square
						such that it is vertical and its edge touches the most forward part of the seat
						backrest.
f) Mark a point on the center line of the seat 4 inches
						in front of the most forward part of the backrest. This point is the seat
						reference point.
F. Camera Lens Height.
1. The camera lens height represents the eye level of the
						average height and weight driver when sitting in the driver's seat. For seats
						that do not sink or compress when occupied, the camera lens height is 30 inches
						above the seat reference point on the unoccupied seat. If a seat sinks or
						compresses when occupied, such as an air suspension seat or a seat with a
						cushion, the average driver's eye level, when sitting in the seat, will be
						lower than 30 inches above the seat reference point on the unoccupied seat, in
						which case seat compression is to be determined by following these
						steps:
a) Select a person weighing at least 195 pounds to
						represent the driver. The driver shall sit on a hard bench or similar surface
						that does not compress when sat on. Measure and record the distance from the
						seat surface to the top of the driver's head. This distance is represented by
						distance D1 in Figure 3.
b) With the driver seated upright in the driver's seat
						(with the seat adjusted as described in Section E.) measure and record the
						distance from the top of the driver's head to an overhead reference point
						directly above. This distance is represented by distance D2 in Figure 3. If an
						overhead reference point, such as a cab ceiling or a roll bar, is not
						available, construct an overhead reference point out of plastic pipe or other
						material.
c) With the seat unoccupied and adjusted as provided in
						Section E, measure the distance from the overhead reference point to the seat
						reference point. This distance is represented by distance D3 in Figure
						3.
d) Calculate seat compression as follows:
Seat compression = D1 + D2 - D3, as illustrated in Figure
						3.
2. Calculate the camera lens height as follows:
Camera lens height = 30 inches minus the seat
						compression.
G. Camera Lens Position.
1. The camera lens position represents the eye position
						of an average height and weight driver. Position the camera lens such
						that:
a) It is directly above the seat reference point,
b) The distance between the center of the lens and the
						seat reference point is equal to the camera lens height calculated in
						subsection F.2, and
c) It points directly towards the retrofit.
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