Bus Operator Workstation Evaluation and Design Guidelines Final Report (1997) / Chapter Skim
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Chapter1. Introduction
Chapter1. Introduction
Pages 1-10
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There are many factors that contribute to the higher than normal morbidity and mortality rates of transit bus operators. Epidemiological studies have concentrated on identifying three main disease categories: cardiovascular disease, gastrointestinal illness and musculoskeletal problems.
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created a mockup of a transit bus operator workstation that was developed using a computer package. This computer program developed by Genicom~ combines both the statistical approach of building a model around 3D "zones", with the theoretical modeling approach in which actual subjects are simulated by changing numerical parameters (Carrier et al., l 992)
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Transit. The modifications have included replacing spring suspension seats with pneumatic ride seats, installing tilt and telescope columns, installing power assist steering, installing left side convex mirrors and relocating the farebox.
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Terminology Terminology Definition H-Point ~ the pivot center for the ~ peso and the thigh (at the hip) Design H-Point the H-Point on the two dimensional seating drafting template placed in any designated seating position Pedal Plane the plane that is parallel to the treadle pedal surface and represents the bottom of the mannequin shoe Seating Reference I a unique H-Point with t e following properties: l Point (SgRP)
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This template can be used to check torso positioning for any specified SgRP and back angle, front seat operator leg and foot position for any specified accelerator heel point location, front seat operator leg and foot position for any specified undepressed accelerator pedal location, and front seat operator leg and foot position for specified leg room and SgRP-front to heel distance. At this point the location of the operator's heel on the treadle pedal, HPoint on the seat and lower leg position are known.
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Table 1.2: Transit Bus Operating Task Analysis PRE-DRIVING TASKS . _ _ TASK NAME TASK DESCRIPTION enter bus I typically enter thr ugh the front door l store personal items adjust seat adjust steering wheel adjust mirrors apply safety belt store personal items such as coat and lunch in appropriate locations adjust the seat height, fore/aft location, seat back angle and head rest based on comfort and visibility adjust steering wheel telescope and tilt to accommodate reach and visibility adjustment of outside and interior mirrors for optimal viewing l application of the safety belt - 1.6
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communicate with transit dispatch, and other bus operators 2.) public announcements inside and outside of the bus adjust climate controls for changing conditions adjust the defrost on the mirrors and windshield when appropriate monitor the indicator and bell tl= to get off the bus .
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of farebox, the amount placed inside may have to be inspected before allowing it to drop into the collection container ride passes have to be updated for each use transfer tickets need to be issued to passengers that are transferring to another bus record passenger data close bus doors deactivate kneeling mode some transit districts require the operator to record the type of fare of all passengers in preparing to depart a stop, the first task is close all doors deactivate the kneeling mode - 1.8
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or behind the minimum safety lines near the doors and windshield apply the left turn signal, and then deactivate the four way flashers if the parking brake has been set, release it remove the service brake and apply pressure to the accelerator 1.3 Bus Operator Survey A survey was conducted to obtain input from bus operators (Bucciaglia, 1995~. A complete description of the survey including the form and raw data is presented in Appendix A
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Complicated seat adjustments, lack of outside mirror control and poor control layout were cited as elements of deficient workstation designs.
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