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CEE 121
MIDTERM
questions with
100% correct
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The following are federal transportation agencies: a. FHWA b. FTA c. NHTSA d. All of the above - answer d. all of the above The Federal Aid Highway Act of 1956 created the: a. Transcontinental railroad b. Requirement for environmental impact statements for highway projects c. Interstate system d. None of these - answer c. Interstate system Major urban transportation projects may induce latent demand, generating new trips that were not previously made: True/False - answer True
The construction cost of most of the US Interstate highway system is shared between Federal and State funding, respectively, as follows: a. 80%/20% b. 20%/80% c. 90%/10% d. 50%/50% - answer c. 90%/10% The Highway Trust Fund is administered by the: a. California Transportation Commission b. Metropolitan Planning Organizations c. Federal Government d. AASHTO - answer c. Federal Government Gasoline taxes provide a sound and sustainable basis for financing future transportation projects: (True/False) - answer False Important socioeconomic factors known to affect travel behavior include: a. income b. household size c. auto availability d. all of the above - answer d. all of the above The US Federal gasoline tax is: a. 79.4 cents/gallon b. 55.4 cents/gallon c. 18.4 cents/gallon d. none of these - answer c. 18.4 cents/gallon
Caltrans has ___ Districts in California: a. 7 b. 11 c. 12 d. none of these - answer c. 12 (Orange is in district 12) The transportation acronym "AASHTO" stands for: a. American Association of State Highway and Transportation Officials b. Association for the Advancement of State Highway and Transit Organizations c. Administration of Associated State Highway Technical Officials d. None of these - answer a. American Association of State Highway and Transportation Officials Vehicle skid marks at an accident scene are indicative of the: a. total stopping distance b. perception-reaction distance for braking c. braking distance (prior to any impact) d. none of these - answer c. braking distance (prior to any impact) A common pedestrian design walking speed for traffic design purposes is: a. 1 mph b. 2 mph c. 4 mph d. 6 mph - answer c. 4 mph If a vehicle's velocity is doubled, the force required to overcome aerodynamic resistance is: a. decreased by a factor of 4 b. increased by a factor of 4
c. increased by a factor of 8 d. decreased by a factor of 8 e. unchanged - answer b. increased by a factor of 4 The most recent and most aerodynamic production passenger cars have a drag coefficients of: a. over 1. b. 0.75 - 1. c. 0.50 - 0. d. 0.25 - 0. e. less than 0.25 - answer e. less than 0. For design purposes, the coefficient of friction used in calculating stopping sight distance is for a: a. vehicle with antilock brakes on wet pavement b. vehicle skidding on dry pavement c. vehicle with antilock brakes on dry pavement d. vehicle skidding on wet pavement - answer d. vehicle skidding on wet pavement A Vehicle's rolling resistance increases linearly with vehicle speed: (True/False) - answer True The AASHTO braking perception-reaction time for highway design purposes is: a. 1.0 sec b. 1.5 sec c. 2.5 sec d. 3.5 sec - answer c. 2.5 sec One horsepower is equal to ______ ft-lb/sec
If someone with 20/20 vision can just read a sign at a distance of 200 ft., a person with 20/40 vision can just read the sign at: a. 400 ft b. 200 ft c. 500 ft d. 100 ft - answer d. 100 ft The design perception-reaction time for a vehicle traveling through a signalized intersection is reduced (versus the AASHTO braking perception-reaction time) because: a. the driver has already stopped at a red light b. the driver is mentally prepared to stop c. it is the 15th percentile value d. it is not reduced relative to the value used in stopping sight distance calculations - answer b. the driver is mentally prepared to stop A dilemma zone at a traffic signal approach is an upstream section of roadway where the driver is too far away from the stopline to safely continue and clear the intersection at constant speed at the end of a green phase, and is also: a. far enough away to safely brake b. too close to safely brake c. potentially so surprised by the yellow signal phase that their increased perception-reaction time prevents them braking quickly enough d. B and C - answer b. too close to safely brake The low point of a sag parabolic vertical curve is never at the station of the PVI: (True/False) - answer False
The assumed height of an object used in the stopping sight distance formula for crest vertical curves is: a. 3.5ft b. 0.5ft c. 1.0ft d. 0ft - answer b. 0.5ft The ______ view of a highway corresponds to the vertical alignment a. Plan b. 2-D c. Profile d. 3-D - answer c. Profile Sag vertical curves may be designed based on passing sight distance and stopping sight distance, however only passing sight distance must be provided, whereas stopping sight distance is optional. (True/False) - answer False Given a PVC (Sta. 5+55.0 and elev. 250.3 ft) of a crest vertical curve that joins a grade of +2.5% and -2.3%, and has a length of 1080 ft, the PVI station is: a. 17+35. b. 10+95. c. 8+05. d. 11+80. e. 5+90.0 - answer b. 10+95. Broken back vertical curves (2 vertical curves in the same direction separated by a short tangent section) are encouraged for use in highway design, particularly for aesthetic reasons.
Point A on a road is located 1050ft from Point B, measured horizontally along the road centerline. What is the station of Point A, given that Point B is at station 25+50. and Sta B is larger? a. 27+00. b. 24+00. c. 36+00. d. 15+00.00 - answer d. 15+00. In highway vertical curve design, the more common case is that the vertical curve length is _______ than the stopping sight distance. a. Greater b. Less - answer a. Greater In hilly terrain it may be less expensive to design a 4-lane road using stopping sight distance to control vertical curve lengths than to design a 2- lane road using passing sight distance to control vertical curve lengths. (True/False - answer True Relevant criteria for highway sag curve design include: a. Headlight illumination at night b. Rider comfort c. Drainage control d. Appearance e. All of the above - answer e. All of the above Horizontal alignment shall provide at least the following at all points on the highway: a. minimum stopping sight distance b. minimum passing sight distance c. both A and B
d. none of the above - answer a. minimum stopping sight distance For a highway right-turning horizontal curve (with stations increasing from left to right), Sta PT can be found from: a. Sta PI - (Tangent distance) + (Length of curve) b. Sta PI + (Tangent distance) c. Sta PC + 2x(Tangent distance) d. a) or b) e. None of the above - answer a. Sta PI - (Tangent distance) + (Length of curve) The Caltrans maximum allowed superelevation rate, emax, on 2-lane highways is: a. 18% b. 12% c. 9% d. there is no defined maximum - answer b. 12% Horizontal curves are viewed in a ______ view of the highway a. Profile b. Grade line c. Plan d. Circular - answer c. Plan In designing horizontal curves, the length of curve is measured __________ a. Along the tangent to the curve. b. Around the curve, along the middle of the outermost lane. c. Around the curve, along the centerline of the roadway. d. Along the chord connecting the PC and the PV. - answer c. Around the curve, along the centerline of the roadway.
a. Tangent length b. Vertical curvature of the roadway c. Stopping sight distance d. Weather conditions - answer c. Stopping sight distance For a given design speed, as the superelevation rate decreases, the minimum horizontal curve radius required by Caltrans: a. Increases b. Decreases c. Remains constant - answer a. Increases Which of the following is a correct method for determining the station (where stations increase from left to right in a plan view) of the PT for a simple circular horizontal curve? a. Station PI + (tangent distance) b. Station PI + (length of curve) / 2 c. Station PC + (length of curve) d. Station PC + (tangent distance) x 2 e. Station PI - (tangent distance) f. Station PI - (tangent distance) + (length of curve)/2 - answer c. Station PC + (length of curve) Compound Horizontal Curve A. Two consecutive horizontal curves that turn in opposite directions B. Horizontal curve with a single, constant radius C. Two or more circular horizontal curves with centers on the same side of the centerline D. Horizontal curve with continuously changing radius E. Parabolic curve of fixed length - answer C. Two or more circular horizontal curves with centers on the same side of the centerline
Reverse Horizontal Curve A. Two consecutive horizontal curves that turn in opposite directions B. Horizontal curve with a single, constant radius C. Two or more circular horizontal curves with centers on the same side of the centerline D. Horizontal curve with continuously changing radius E. Parabolic curve of fixed length - answer A. Two consecutive horizontal curves that turn in opposite directions Simple Horizontal Curve A. Two consecutive horizontal curves that turn in opposite directions B. Horizontal curve with a single, constant radius C. Two or more circular horizontal curves with centers on the same side of the centerline D. Horizontal curve with continuously changing radius E. Parabolic curve of fixed length - answer B. Horizontal curve with a single, constant radius
