Study Questions - Examples

13 Questions | Total Attempts: 242

SettingsSettingsSettings
Study Questions - Examples - Quiz

Select the Best Answer.


Questions and Answers
  • 1. 
    Using the "PRT / LEAD VEHICLE" spreadsheet - The approaching driver is traveling 60 mph (96.5 km/h) and is closing on a stopped lead vehicle that is 6.6 feet (2 m) wide. Using a subtended angular velocity threshold of 0.006 radians per second, at what distance would an average driver appreciate that he is closing dangerously fast on the lead vehicle? VER dist = SQRT [ (w x Vr) / VER angle]
    • A. 

      275 ft. (84 m)

    • B. 

      300 ft. (92 m)

    • C. 

      311 ft. (94.5 m)

    • D. 

      348 ft. (107 m)

  • 2. 
    Using the "PATH INTRUSION - ECCENTRICITY CALCULATION" spreadsheet - A vehicle traveling 20 cubits/fortnight emerges from a driveway that was behind a bush 20 cubits to the left. The main road driver is also traveling a constant speed of 20 cubits/fortnight. If no driver responds, and they crash, the eccentricity will remain a constant 45 degrees.
    • A. 

      True

    • B. 

      False

  • 3. 
    A vehicle that is traveling in the same direction as our subject driver and is 10 degrees left when the vehicle starts moving laterally into the path of the subject driver. It is nighttime and  there is no other traffic in the area. What is the response time for this situation? Which Spreadsheet should you use?
    • A. 

      Path Intrusion

    • B. 

      Lead Vehicle

  • 4. 
    Using the information from above, what has been the average response time for other drivers?
    • A. 

      0.8 seconds (+/- 0.3 seconds)

    • B. 

      1.2 seconds (+/- 0.4 seconds)

    • C. 

      1.4 seconds (+/- 0.5 seconds)

  • 5. 
    A driver on a side road looks left and sees a vehicle approaching. That vehicle is 328 feet left (100 m) and traveling at 82 ft/sec (25 m/s). Using the "GAP ACCEPTANCE" spreadsheet, what is the probability that the side road driver is going to attempt a left turn across one lane (two lane road)? Assume the vehicles are both passenger cars.
    • A. 

      12% (+/- 5%)

    • B. 

      20% (+/- 5%)

    • C. 

      35% (+/- 5%)

    • D. 

      42% (+/- 5%)

  • 6. 
    Using the "LEAD VEHICLE PRT" spreadsheet - what is the most important information on that sheet?
    • A. 

      Average PRT

    • B. 

      Visual expansion rate threshold

    • C. 

      The expected pre-impact maneuver distance

  • 7. 
    Using the "HEADLIGHT" spreadsheet - A pedestrian is crossing from right to left. A vehicle with a 9006 halogen headlight is approaching. Witnesses report that the vehicle appeared to be really dirty and the headlights are aimed improperly downward to the extent that you do not feel comfortable using greater than the 15th percentile headlight beam. The pedestrian crossed 19.7 feet (6 m) at a speed of 4.9 ft/sec (1.5 m/s) (be sure to convert to mph or km/h). The driver was traveling 50 mph (80 km/h), and skidded 66 feet (20 m) before impact at 0.6 Gs on a level surface. The pedestrian struck the center of the vehicle (3.3 feet or 1 m from the left corner). When would the grayish pedestrian have entered the headlight beam (0.3 fc; 3.2 Lux)? Note: The program offers a range that represents the potential error of the mapping, not the range of responses - assume the ranges below are correct.
    • A. 

      161 ft. (50 m) (+/- 40 ft., 12 m)

    • B. 

      196 ft. (60 m) (+/- 40 ft., 12 m)

    • C. 

      177 ft. (54 m) (+/- 40 ft., 12 m)

    • D. 

      131 ft. (40 m) (+/- 40 ft., 12 m)

  • 8. 
    A driver has been following a lead vehicle for the past 4 miles. The lead vehicle suddenly brakes - is this a cued braking situation?
    • A. 

      Yes, the following driver will have the context of an immediate change in following distance in conjunction with the brake lights and slowing. Cueing refers to "Cued that the lead vehicle is traveling slow"

    • B. 

      No, drivers still cannot judge closing speed even if following at a routine distance

  • 9. 
    Using the "AVOIDANCE" spreadsheet - You have determined the following:  - The lateral acceleration was 0.2 Gs  - The driver needed to steer 6 feet (1.8 m) left to avoid the crash  - The deceleration was 0.75 Gs (range of 0.08 Gs)  - Speed of the vehicle was 55 mph (88 km/h) - range (5 mph / 8 km/h)  - The time available to the driver was 3.6 seconds (The vehicles crossed the stop line 3.6 seconds before impact)  - The average PRT was 2 seconds  - The intruding vehicle was traveling 20 ft/sec (6.1 m/s) when struck in the left quarter panel. If the intruding vehicle had time to move forward 5 feet, it would have cleared the impact zone.  - Could the driver stop, steer or slow to avoid the crash? (See AVOIDANCE section)  - Additional time necessary 5 feet to clear / 20 ft/sec = 1/4 sec
    • A. 

      The driver could stop, steer or slow to avoid

    • B. 

      The driver could not stop, but could steer or slow to avoid

    • C. 

      The driver could not stop and could not slow to avoid, but could have steered 6 feet to avoid.

    • D. 

      This driver could not stop, could not steer and could not slow to avoid this crash.

  • 10. 
    Using the "NIGHT RECOGNITION A2B" spreadsheet - What has been the average nighttime recognition distance (corrected to real roads) based upon the six most on-point studies:  - Darkly clothed Adult - Moving - HID headlights - pedestrian coming from the left on a road
    • A. 

      157 ft (48 m) (+/- 90 ft., 27 m)

    • B. 

      202 ft (62 m) (+/- 90 ft., 27 m)

    • C. 

      224 ft (68 m) (+/- 90 ft., 27 m)

    • D. 

      246 ft (75 m) (+/- 90 ft., 27 m)

  • 11. 
    What has been the average recognition distance for a stopped vehicle on an unlit road - gray - no lights - directly ahead - approaching vehicle had H-series headlights 45 mph (72.4 km/h)?
    • A. 

      161 ft (49 m)

    • B. 

      170 ft (52 m)

    • C. 

      213 ft (65 m)

    • D. 

      256 ft (78 m)

  • 12. 
    Using the "PATH INTRUSION" spreadsheet - You are given nothing other than the following - you are not being asked to testify, only for a ROUGH APPROXIMATION of PRT for the following situation - which is the best estimation?  - Nighttime crash on a straight road - driver is in the high speed lane responding to a pedestrian path intrusion
    • A. 

      0.8 seconds

    • B. 

      1.4 seconds

    • C. 

      2.0 seconds

    • D. 

      2.6 seconds

  • 13. 
    Using the "PEDESTRIAN SPEED" spreadsheet - what is the average walking speed for the following:  - Male - In Rain - Alone - Against a don't Walk Signal - In crosswalk - One stage crossing  - Walking fast - Intersection - No challenges  - Crossing a road that is 100 ft. (30 m) wide - he is 21 years old What is the minimum and maximum speed from the available studies?
    • A. 

      3.3 to 4.5 ft/sec (1.0 to 1.4 m/s)

    • B. 

      4.5 to 7.1 ft/s (1.4 to 2.2 m/s)

    • C. 

      5 to 6.4 ft/s (1.5 to 2 m/s)

    • D. 

      5.5 to 6.9 ft/s (1.7 to 2.1 m/s)

Back to Top Back to top