Driven with an averse 20/70 vision travel a, 65 mph on a downgrade 2% freeway se

Question

Driven with an averse 20/70 vision travel a, 65 mph on a downgrade 2% freeway see with a perception reaction time of 2 3 sec. What should be the minimum distance of sign with 6-in letters placed ahead of the exit. Drivers with 20/20 vision can read sign at 60 It per inch of Idler height, The freeway exit speed is 45 mph. A: 461.1 B: 102.85 C: 360 D: 358.25 (a) The elevation of the BVC (beginning of the vertical curve) A: 102 B: 109 C: 191 D: 182 (b) The elevation of the EVC (end of the vertical curve) A: 127 B: 173 C: 191 D: 182 (c) The station of the lowest point of the curve A: 2+25.00 B: 86+50.00 C: 84+25.00 D: 82 + 00.00 (d) The elevation of station 87+00.00 on the curve A: 102.11 B. 109.11 C: 100.11 D: 110.11

Explanation / Answer

3.) (ii) Given, Sag curve details

length of curve = 9100 - 8200 = 900

PVI elevation = 100

g1 = -2 %

g2 = +6 %

a.) ElevBVC = Elevvertex + g1 (L/2) = 100 - (2*4.5) = 109

b.) ElevEVC = Elevvertex + g2 (L/2) = 100 + (6 * 4.5) = 127

c.) Station of the lowest point : 84 + 25.00

d.) Elevation of the station 87 + 00.00 is 110.11

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