Transportation Engineering — Quiz 3

Questions in this quiz (10)

1. An equal-tangent crest vertical curve has a length of $$420\ ft$$ connecting grades of $$+1.0\%$$ and $$-2.0\%$$. Determine the horizontal distance from the PVC to the highest point on the curve.

   • $$140 ft$$
   • $$210 ft$$
   • $$79 ft$$
   • $$120 ft$$

2. In roadway design, what type of vertical curve is most commonly used to smoothly connect two different grades?

   • Circular curves
   • Spiral curves
   • Equal tangent parabolic curves
   • Unequal tangent parabolic curves

3. A sag vertical curve of length $$700\ ft$$ connects grades of $$-2.0\%$$ and $$+1.0\%$$. If the elevation at PVC is $$233.80\ ft$$, determine the minimum elevation on the curve.

   • $$204.43 ft$$
   • $$234.33 ft$$
   • $$219.13 ft$$
   • $$229.13 ft$$

4. A simple circular curve has a radius of $$600\ ft$$ and an intersection angle of $$41^\circ$$. If the PI is located at station $$8+00$$, determine the station of the PC.

   • $$2+25$$
   • $$5+00$$
   • $$5+76$$
   • $$6+00$$

5. A circular horizontal curve has a central angle of $$39^\circ$$ and radius $$600\ ft$$. Determine the arc length of the curve.

   • $$378 ft$$
   • $$408 ft$$
   • $$466 ft$$
   • $$534 ft$$

6. A simple horizontal circular curve has an intersection angle of $$5.6^\circ$$. The PI is located at station $$12+45.20$$, and the degree of curve is $$4^\circ$$. Determine the station of the PT.

   • $$sta 14+03.88$$
   • $$sta 13+15.14$$
   • $$sta 12+03.88$$
   • $$sta 13+64.28$$

7. During one commuter peak hour, the total traffic volume is $$3500$$ passenger-car equivalents per hour. The four consecutive $$15$$-minute counts are $$650$$, $$920$$, $$1140$$, and $$790$$ vehicles. Determine the peak hour factor.

   • 0.30
   • 0.77
   • 1.3
   • 1.7

8. A crest vertical curve joins a $$+1\%$$ grade to a $$-3\%$$ grade. The design stopping sight distance is $$1000\ \mathrm{ft}$$, the driver eye height is $$4.0\ \mathrm{ft}$$, and the object height is $$0.5\ \mathrm{ft}$$. Determine the minimum curve length required to satisfy stopping sight distance.

   • 800 ft
   • 1000 ft
   • 1500 ft
   • 2727 ft

9. A vertical alignment consists of a $$+7\%$$ back grade and a $$-5\%$$ forward grade connected by an equal-tangent vertical curve of length $$1150\ \mathrm{ft}$$. The PVI is at station $$20+35$$ and elevation $$250.0\ \mathrm{ft}$$. Determine the elevation of the curve at station $$21+35$$.

   • 233.23 ft
   • 252.8 ft
   • 254.2 ft
   • 255.0 ft

10. A simple horizontal circular curve has a radius of $$1000\ \mathrm{ft}$$. Determine the degree of curve using the arc definition.

    • $$4.00°$$
    • $$5.73°$$
    • $$6.00°$$
    • $$12.00°$$