CE 321 - Study Guide

# CE 321 - Study Guide - REVIEW MATERIAL Theoretical and...

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REVIEW MATERIAL Theoretical and Practical stopping distance - Theoretical Stopping Distance: “Adequate” driver sight distance to permit a safe stop - Practical Stopping Distance: Same but with different driver skills, vehicles, weather, braking efficiency factors Two harmful myths and a thesis Myths -Roads built to design standards are safe -Roads don’t cause crashed. Humans do. Example: A driver was going north on a highway at 70 km/h where the speed limit is 50 km/h. and intended to take a ramp turning right on a tight curve. The advised speed on the curve is 35 km/h. The driver wasn’t aware of how much he needed to slow down to make the turn curve and there was no guiderail at that point. As a result, the vehicle skidded down the embankment. The rear door opened and the child flew out of the car and was severely injured. He also wasn’t wearing a seatbelt. Despite there being human error, Road design could have prevented a chance of a crash or the severity of the crash. Traffic Stream Parameters and models Primary purpose / function of a highway is safety and mobility Influences number of lanes, pavement types, geometric design, traffic control devices.

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