Midterm solution

Midterm solution - CME 302 Midterm Fall 2006 Oct 11...

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CME 302 Midterm, Fall 2006, Oct 11, 5-6:15pm Name___________________ This is an open-book, open-note exam. There are a total of 60 points. Try to be as specific and detailed as possible in your answers because every step counts! 1. A rural freeway has two 12-ft lanes in each direction, with right shoulder lateral clearance of 3.6 feet. Base free flow speed is 75 mph. Interchanges are spaced approximately 3 miles apart. Traffic consists of 10 percent trucks and buses and 8 percent recreational vehicles. The adjustment for driver population factor is estimated to be 0.80. If the maximum 15-min flow rate is 1,760 veh/h, what is the level of service on a 1.1 mile long 3.1 percent upgrade? (10 pts) Determine free-flow speed: mph FFS f f f f f f f f BFFS FFS ID N LC LW ID N LC LW 5 . 73 0 . 0 0 . 0 5 . 1 0 . 0 0 . 75 0 . 0 0 . 0 5 . 1 0 . 0 = - - - - = = = = = - - - - = (2 pts) Determine adjustment factors: Driver population factor: 80 . 0 = p f Heavy vehicle factor: 0 . 2 0 . 3 = = R T E E 78 . 0 28 . 1 1 ) 1 0 . 2 ( 08 . 0 ) 1 0 . 3 ( 10 . 0 1 1 = = - + - + = HV f (2 pts) Determine v p : p HV p f f N PHF V v × × × = (2 pts) Determine LOS: h pc f f N PHF V v p HV p / 2820 80
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Midterm solution - CME 302 Midterm Fall 2006 Oct 11...

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