Human Factors Guidelines for Road Systems - Collection C: Chapters 16, 17, 18, 19, 20, 22 (Tutorials 4, 5, 6), 23 (Updated), 24, 25, 26 (Updated) (2010) / Chapter Skim
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inside car 70 Freeway traffic 90 Truck 75-80 Inside heavy truck cab 95-100 Motorcycle 85 City traffic inside car 110 Car horn EFFECTS OF DIFFERENT SRS DIMENSIONS ON AUDITORY / TACTILE ALERTS Characteristic Suitable Values Direct Effect on Driver Implications for Effectiveness Lateral 6+ in. from lane Drivers encounter the alert sooner, the The sooner the warning occurs, the placement / edge (but depends closer it is to the lane edge.
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Laboratory driving simulator studies show that usually drivers easily detect steering wheel or brake pedal vibrations of 1.2-1.5 Nm torque presented over half a second. In contrast to passenger vehicles, cab vibrations in heavy trucks are significant and the size and weight of heavy trucks reduce the vibrations generated by SRS; therefore, the vibration component of SRS is viewed to have minimal benefit for alerting heavy truck drivers.
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