Test: Spot Speed Study - Civil Engineering (CE) MCQ

# Test: Spot Speed Study - Civil Engineering (CE) MCQ

Test Description

## 10 Questions MCQ Test Transportation Engineering - Test: Spot Speed Study

Test: Spot Speed Study for Civil Engineering (CE) 2024 is part of Transportation Engineering preparation. The Test: Spot Speed Study questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Spot Speed Study MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Spot Speed Study below.
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Test: Spot Speed Study - Question 1

### Why are Spot speed studies conducted?

Detailed Solution for Test: Spot Speed Study - Question 1

Spot speed studies are conducted to document the distribution of vehicle speeds as they pass a cross-section of the highway. Spot speed is the instantaneous speed of a vehicle at a location.

Test: Spot Speed Study - Question 2

### 'Spot speed study' is useful in which of the (following) aspect/s of traffic engineering?

Detailed Solution for Test: Spot Speed Study - Question 2

Spot Speed Study

• Spot speed studies are used to determine the speed distribution of a traffic stream at a specific location. The data gathered in spot speed studies are used to determine vehicle speed percentiles, which are useful in making many speed-related decisions.

Spot speed studies have a number of safety application as follows:

• Speed trends
• Traffic control planning
• Accidental analysis
• Geometric design
• Research studies

Enoscope Method

• It consists of a simple open housing containing a mirror mounted on a tripod at the side of the road in such a way that an observer's line of sight turns through 90°. It is an easy, economical but slow method.
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Test: Spot Speed Study - Question 3

### On a freeway, spot speed studies are not conducted if the traffic volumes exceed _____

Detailed Solution for Test: Spot Speed Study - Question 3

On a freeway, spot speed studies are not conducted if the traffic volumes exceed 750-1000 veh/hr/ln. On an uninterrupted flow facility, the spot speed studies are not conducted if the traffic volumes exceed 500 veh/hr/ln.

Test: Spot Speed Study - Question 4

The outcome of the spot speed studies carried out at a certain stretch of a highway are as follows.
50th percentile speed = 46 km/h ; 75th percentile speed = 54 km/h ; 85th percentile speed = 60 km/h ; 95th percentile speed = 75 km/h ; 98th percentile speed = 84 km/h ; 100th percentile speed = 95 km/h
What is the speed (in km/h units) to be taken to check the geometric design elements.

Detailed Solution for Test: Spot Speed Study - Question 4

The 98th percentile speed is adopted for the geometric design of highways.

Geometrical design speed = 98th percentile speed
Safe speed limit = 85th percentile speed
Minimum speed limit = 15th percentile speed
From the data given in the problem, 98th percentile speed = 84 km/h

Test: Spot Speed Study - Question 5

The mean speed of all the vehicles crossing a location is known as ________

Detailed Solution for Test: Spot Speed Study - Question 5

The mean speed of all the vehicles crossing a location is known as Time mean speed during the period of study. Time mean speed is the mean of instantaneous speeds. It helps to decide the distribution of speeds of vehicles.

Test: Spot Speed Study - Question 6

Which of the following is taken as the highest safe speed limit, derived from spot speed study, for a highway?

Detailed Solution for Test: Spot Speed Study - Question 6

The 98th percentile speed is adopted for geometric design of highway.

Geometrical design speed = 98th percentile speed
Safe speed limit = 85th percentile speed
Minimum speed limit = 15th percentile speed

Test: Spot Speed Study - Question 7

Which of the following is a method to measure spot speed?

Detailed Solution for Test: Spot Speed Study - Question 7

Long Base method is a method to measure spot speed. In the Long Base method, vehicles are timed over a long distance. The second method to measure spot speed is Short Base method. In the Short Base method, vehicles are timed over a short distance of about 2m.

Test: Spot Speed Study - Question 8

Which of the following is not a procedure of Long base method?

Detailed Solution for Test: Spot Speed Study - Question 8

Radar speed meters is not a procedure of Long base method. Direct Timing procedure, Enoscope, and Pressure contact tubes are the procedure of Long base method.

Test: Spot Speed Study - Question 9

Which of the following is an advantage of Enoscope?

Detailed Solution for Test: Spot Speed Study - Question 9

The advantage of Enoscope is that it eliminates Parallax error. Enoscope is also inexpensive, simple, and easily installable. Enoscope is also called Mirror box. It is an L- shaped box with a mirror set at 45 degrees to the arms of the instrument.

Test: Spot Speed Study - Question 10

The average difference between observed speeds and time mean speed is _____

Detailed Solution for Test: Spot Speed Study - Question 10

The average difference between observed speeds and time mean speed is Standard deviation. 85th percentile speed is the speed beneath which 85% of the vehicles are driven. Median is the speed that equally divides the spot speed distribution.

## Transportation Engineering

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## Transportation Engineering

26 videos|91 docs|58 tests