The license plates of motor vehicles having letters 3 inches high can be read by a person with 20/20 vision at a maximum distance of 54 feet for every inch height of letter. A witness with 20/40 vision testifying in court regarding a speeding driver claims that he noted the license plate number accurately when he was 85 feet from this speeding car that goes in the same direction. If he claims that he took 1.5 seconds to read the license plate, what is the reliability of his testimony?

The license plates of motor vehicles having letters 3 inches high can be read by a person with 20/20 vision at a maximum distance of 54 feet for every inch height of letter. A witness with 20/40 vision testifying in court regarding a speeding driver claims that he noted the license plate number accurately when he was 85 feet from this speeding car that goes in the same direction. If he claims that he took 1.5 seconds to read the license plate, what is the reliability of his testimony?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter4: Traffic Engineering Studies

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A witness with 20/60 vision supplied to the investigating officer the license plate number of a vehicle involved in a hit-and-run accident. If, under the conditions that prevailed at the time of accident, a license plate can be read by a person with 20/20 vision from a distance of 180 feet, what is the maximum distance for which the witness’s testimony can be relied upon?
A driver with 20:40 vision needs 2 sec to read a sign posted on a freeway. A person with 20/20 vision can read this sign at a distance of 225 ft. Do you feel that the driver has suffi- cient time to read this sign driving at a speed of 55 mph? At what speed would he have to travel just io be able to read the sign? Discuss this problem.
A driver hit a pedestrian resulting in minor injuries. He was claiming that he followed the posted design speed at 80 kph (running speed368 kph) and perceived the design speed wasn't correct. Investigate the engineer's claim. (Prove by computation) a.) Was the driver's claim correct? b.) If yes, what should be the posted design speed? If not, what might be the other reasons for the pedestrian accident? Accident Report: - Driver was able to see the pedestrian 80 m ahead - Coefficient of friction 0.4 - Grade of the highway is zero - Time of accident: 8 AM - Weather condition: Fair - skid marks were not clear
and report the A driver with 20/20 vision can read a given sign at a distance of 100 ft from the sign. At what distance would another driver read the same sign with 20/30 vision ● 20/40 vision 20/X vision (Give your answer with respect to X)
You and your partner have been dispatched to a report of a motorcycle crash on a curvy back road. Fellow riders at the scene reported the patient was travelling too fast to negotiate a sharp curve and was thrown over a guardrail into a tree. They carried the patient up an approximate 4-foot embankment to the road.Upon your arrival, you find a male patient you estimate to be between 20 – 25 years of age, being cared for by a police officer who has opened the airway using an NPA and is administering oxygen via an NRB. The officer reports the patient has been unconscious since she got to the scene. Looking down the embankment, you see the patient’s helmet and note it has sustained significant damage.As you approach the patient, you observe the patient has gross angulation involving his left lower leg and deformity to his right humerus.1. In addition to scene safety, what else would you evaluate during your initial scene size-up?2. What specific information other than that gathered through…
An engineering student is driving on a level roadway and sees a construction sign 500 ft ahead in the middle of the roadway. the student strikes the sign at a speed of 25 mi/h. if the student was traveling at 55 mi/h when the sign was first spotted, what was the student's associated perception/ reaction time? (Use practical stopping distance)
5. An engineering student is driving on a roadway with a -1% grade and sees a traffic barricade 600 ft ahead in the middle of the roadway. Despite his best effort to stop in time, the student strikes the sign at a speed of 40 mi/hr. If the student was traveling at 70 mi/hr when the sign was first spotted, what was the student's associated perception-reaction time (use practical stopping distance). 6. A driver is traveling at 62 mi/hr on a wet road. An object is spotted on the road 600 ft ahead and the driver is able to come to a complete stop just before hitting the object. Assuming perception-reaction time of 2.5 seconds and practical stopping distance, determine the grade of the road.
A driver hit a pedestrian resulting in minor injuries. He was claiming that he followed the posted design speed at 80 kph (running speed=68 kph) and thought the design speed was not correct. Investigate the engineer's claim. (Prove by computation) a.) Was the driver's claim correct? b.) If yes, what should be the posted design speed? If not, what might be the other reasons for the pedestrian accident? Accident Report: - Driver was able to see the pedestrian 80 m ahead - Coefficient of friction = 0.4 Grade of the highway is zero - Time of accident: 8 AM - Weather condition: Fair - skid marks were not clear
The driver of a vehicle is following another vehicle in front of her on a two-lane highway at night. She keeps a clearance of one car length for every 4 mph of speed while she follows the lead car. However, while going downhill at 56 mph, the lead car crashes into the rear of an unlighted abandoned truck. At what speed will her car hit the wreckage? Assume a perception-reaction time is 2 seconds, a deceleration rate of 11.2 feet/sec2, the length of cars of 18 feet, and the road grade as 3%.
3. An engineering student at Siliman Universty is driving on a level roadway and sees a construction sigh 600 feet ahead in the middle of the roadway. The student strikes the sign at a speed of 35 mph. If the student was traveling at 55 mph when the sign was first spotted, what was the student's associated perception/reaction time? Assume that the deceleration is 11.2 ft/s?.
What is the minimum decision sight distance (in meters) for a vehicle travelling at 20 MPH to change lane to an exit ramp in an urban road? What is the minimum decision sight distance (in meters) for a vehicle travelling at 20 MPH to change lane to an exit ramp in a sub-urban road? A vehicle traveling at 30 KPH was stopped within 2.50 seconds after application of brakes. Determine the average skid resistance. Compute the total stopping sight distance (in feet) that a car moves during an emergency stop based on the following data: A. Initial velocity of car = 35 MPH B. Final velocity when it stops after 6 seconds = 0 KPH C. Slope of roadway = 2% (downhill) D. Perception-reaction time = 0.80 seconds
An engineering student is driving on a level roadway and sees a construction sign 500 ft ahead in themiddle of the roadway. The student strikes the sign at a speed of 25 mi/h. If the student was traveling at 55 mi/h when the sign was first spotted, what was the student’s perception/reaction time?