HW4 - The University of Texas at Austin Chandra Bhat Dept...

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Unformatted text preview: The University of Texas at Austin Chandra Bhat Dept of Civil, Architectural & Environmental Engineering Fall 2016 CE 321 Transportation Systems Homework Assignment No. 4 Human and Vehicle Characteristics Date distributed: October 25, 2016 Due date: November 1, 2016. l. . Suppose the formal eye examination administered for driving license issuance can only identify those near-sighted individuals with an eye-sight worse than 20/25. Consequently, the population of drivers includes many near-sighted. drivers whose eye-sight is as poor as 20/25 but yet no corrective lens restriction are imposed on their driving license. With the aboVe scenario in mind, determine the size of letters on an exit ramp sign requiring drivers to slow down from a design speed of 70 mph to 40 mph by the time they reach the location of the posted sign (g = 0, rpm = 2.5 sec, and assume fskid : 0.28). ' / rfl'tu'iql- mg“. I . 2. In the collision of a vehicle of 1500 kg in mass with a parked car, the damage inflicted on the two vehicles indicates an impact energy of 6000 joules. The vehicle has left a 125-foot skid mark. In subsequent test skids at the location of the accident, the following relationship was . (M) V (.2 V? found between fskid and the speed of the vehicle V in mph at the time the wheels were locked: l r a" 2 jfl[ff J.“ fskid = 0.5 —' 0.002V r ' " " \ W .. [,grpetermine the initial speed V of the vehicle before the driver locked the wheels assuming a . v' ; ’4‘ _- =1 level surface. trfifi v”““ Note: 1 joule = 1 kg*(meter2/secz) and 1 mile ‘= 1600 meters 3. A truck traveling at 25 mph is approaching a stop Sign. At a distance of 60 feet from the sign, the truck begins to decelerate at a constant rate of 14 ft/secz. Will the truck be able to stop in time? \ffi t \[0 .f at, l ./ flit“ - . ...
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