1. Which of the following formula gives the correct determination of the minimum number of test runs in a floating car method?
a) N=((tα χ σ)/d*2)
b) N=((tα χ σ)/d*3)
c) N=((tα / σ)/d*2)
d) N=((tα + σ)/d*2)
Explanation: N=((tα χ σ)/d*2) gives the correct determination of the minimum number of test runs in a floating car method. Here, N = number of sample size or minimum number of test runs, α = significance level, σ = standard deviation, d = limit of accepted error.
2. What are the limit of acceptable error for traffic operations, economic evaluation, and trend analysis studies?
a) ±2.0 to ± 4.o mi/l
b) ±3.0 to ± 4.o mi/l
c) ±1.0 to ± 4.o mi/l
d) ±0.0 to ± 4.o mi/l
Explanation: The limit of acceptable error for traffic operations, economic evaluation, and trend analysis studies is ±2.0 to ± 4.o mi/l. The limit of acceptable error is expressed as ‘d’. It is ±3 to ± 5.o mi/l for Highway needs and planning studies.
3. In floating car method, the travel time is taken as the mean time recorded during the repeated procedure.
a) True
b) False
Explanation: “In floating car method, the travel time is taken as the mean time recorded during the repeated procedure” is a true statement. Multiple numbers of test runs are done to get almost accurate data and results.
4. What is acceleration noise?
a) Degree of discomfort of driver due to acceleration and deceleration
b) Degree of discomfort of driver due to pedestrians
c) Degree of discomfort of driver due to control devices
d) Degree of discomfort of driver due to inadequate spacing
Explanation: Acceleration noise is the degree of discomfort of driver due to acceleration and deceleration. It is calculated as the root mean square value of acceleration considering each second of operation one by one.
5. The average journey time T in minutes in the direction of flow is calculated by.
a) T = tw – (ny/q)
b) T = tw + (ny/q)
c) T = tw x (ny/q)
d) T = tw / (ny/q)
Explanation: The average journey time T in minutes in the direction of flow is calculated by T = tw – (ny/q). Here, T = average journey time in minutes, tw = average journey time when test vehicle is travelling with the stream q.
6. The average volume in floating car method is calculated by.
a) q = (na+ny)/(ta+tw)
b) q = (na-ny)/(ta+tw)
c) q = (na+ny)/(ta-tw)
d) q = (na+ny)x(ta+tw)
Explanation: The average volume in floating car method is calculated by q = (na+ny)/(ta+tw). Here, tw = average journey time when test vehicle is travelling with the stream q, ta = average journey time when test vehicle is travelling against the stream q.
7. Floating car method is suitable for which type of road?
a) Multilane highways
b) Village roads
c) State highways
d) 2 lane 2 way highways
Explanation: Floating car method is suitable for 2 lane 2 way highway type of road. It is difficult to be applied on multilane highways. In a floating car method, the driver floats with the traffic by passing as many vehicles as possible.
8.When is inaccuracy most likely to occur in floating car method?
a) During periods of congested flow on multi-lane highways
b) In village roads due to bad road conditions
c) When there are lots of potholes
d) During non-peak hours in city roads
Explanation: Inaccuracy is most likely to occur in floating car method during periods of congested flow on multi-lane highways. It also might give inaccurate results on roads with extremely low traffic volumes.
9. How many methods are used for the origin-destination study?
a) 6
b) 1
c) 5
d) 4
Explanation: There are 6 methods for conducting the origin-destination study. The data collected from these studies help to modify or plan the pattern of the road. It also helps to compare the current and future potential of the road.
10. Which among the following is an origin-destination study?
a) Licence plate mail-out method
b) Traffic mass study
c) Floating car method
d) Average speed method
Explanation: Licence plate mail-out method is an origin-destination study by which data is collected to help develop trip generation and trip distribution models and to determine the potential of the present highway system and plan for new facilities.