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Question 1
ప్రశ్న 1
A traffic counter records 720 vehicles crossing a fixed road section during 30 minutes. Which distinction between traffic volume and equivalent hourly flow rate is correct?
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Explanation:
Traffic volume is the number of vehicles observed over a stated counting interval. The observed volume is 720 vehicles during 30 minutes. Doubling this count gives an equivalent rate of 1,440 vehicles per hour. That extrapolated hourly rate does not prove that 1,440 vehicles actually passed during a complete hour. A traffic study should report the period and direction alongside the count or flow rate.
వివరణ:
Question 2
ప్రశ్న 2
An urban road carries motorcycles, cars, autorickshaws, buses and trucks. Which study provides the most useful input for analysing the traffic composition and PCU-equivalent demand?
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Explanation:
Mixed traffic comprises vehicle classes with differing dimensions and performance. Classified counts record how many vehicles of each category pass the count location. Directional and time-interval separation makes peak demands easier to assess. Suitable class-specific PCU factors can then be applied for a stated analysis context. An undifferentiated total count cannot reveal the traffic composition needed for that calculation.
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Question 3
ప్రశ్న 3
A highway authority needs continuous classified volume data across several days on a busy non-urban corridor. Which arrangement best reflects Indian traffic-survey practice?
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Explanation:
IRC traffic-survey guidance recognises automatic classifiers, infrared systems and video-based counts. Such systems can collect long-duration observations without continuous manual tallying. Their accuracy nevertheless depends on installation, classification rules and operating conditions. Mixed vehicle types and sensor errors make field checks important. A suitable survey therefore includes calibration and validation rather than relying uncritically on raw machine output.
వివరణ:
Question 4
ప్రశ్న 4
A seven-day highway count is intended to represent traffic on a homogeneous interurban section. Where should the count station preferably be located?
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Explanation:
Traffic can change substantially at major intersections and local access points. A station serving a homogeneous road section should reflect traffic moving along that section. Count locations must therefore be selected with knowledge of traffic entry and exit patterns. Directional and classified data provide more informative records than an undifferentiated total. Site access, equipment safety and representative observation conditions also influence final station selection.
వివరణ:
Question 5
ప్రశ్న 5
A permanent counter recorded 1,825,000 vehicles during a complete non-leap calendar year of 365 days on a highway section. What is its annual average daily traffic (AADT)?
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Explanation:
Annual average daily traffic is total recorded annual vehicle volume divided by the number of days in that year. The problem specifies a complete non-leap year containing 365 days. Dividing 1,825,000 by 365 gives 5,000. The AADT is therefore 5,000 vehicles per day for the counted section and stated directions. This yearly average should not be confused with the maximum daily or peak-hour volume.
వివరణ:
Question 6
ప్రశ్న 6
A seven-day 24-hour classified count records 8,000 vehicles per day on each of five weekdays and 5,000 vehicles per day on each of two weekend days. What is the observed seven-day average daily traffic (ADT)?
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Explanation:
The five weekday counts contribute 5 times 8,000 = 40,000 vehicles. The two weekend counts contribute 2 times 5,000 = 10,000 vehicles. Total observed seven-day traffic is 50,000 vehicles. Dividing by seven yields approximately 7,142.86 vehicles per day. This is the seven-day ADT and is not automatically the annual AADT without appropriate seasonal adjustment.
వివరణ:
Question 7
ప్రశ్న 7
A representative seven-day count gives ADT = 6,000 vehicles/day. A justified seasonal conversion factor for estimating annual average conditions is supplied as 1.15. What AADT is obtained by applying this multiplicative factor?
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Explanation:
The problem explicitly defines a multiplicative adjustment to the measured daily average. The reported seven-day ADT is 6,000 vehicles per day. Multiplying by 1.15 gives 6,900 vehicles per day. This is the estimated AADT under the supplied seasonal relationship. In actual studies, the factor must be established from suitable continuous or representative count information rather than assumed universally.
వివరణ:
Question 8
ప్రశ్న 8
Four consecutive 15-minute vehicle counts during the selected peak hour are 240, 270, 330 and 260. Using PHF = hourly volume/(4 times maximum 15-minute volume), what is the peak-hour factor?
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Explanation:
The total peak-hour volume is 240 + 270 + 330 + 260 = 1,100 vehicles. The largest 15-minute count is 330 vehicles. Four times this value gives an equivalent hourly rate of 1,320 vehicles per hour. The peak-hour factor equals 1,100/1,320 = 0.8333. This factor indicates nonuniform flow within the selected hour and cannot exceed one when computed consistently.
వివరణ:
Question 9
ప్రశ్న 9
During the busiest 15-minute interval of a traffic study, 420 vehicles cross a point in one direction. What is the equivalent hourly flow rate for that interval, rather than the observed one-hour volume?
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Explanation:
A 15-minute period is one quarter of an hour. Converting its count to an equivalent hourly rate requires multiplication by four. The result is 420 times four = 1,680 vehicles per hour. This rate characterises the selected short interval. It does not assert that 1,680 vehicles were actually recorded in any complete 60-minute period.
వివరణ:
Question 10
ప్రశ్న 10
Six consecutive 15-minute counts on a road are 180, 200, 250, 260, 240 and 210 vehicles. What is the highest total for any four consecutive intervals in this record?
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Explanation:
A one-hour volume can be formed by summing four consecutive 15-minute counts. The first available hour totals 180 + 200 + 250 + 260 = 890 vehicles. The next hour totals 200 + 250 + 260 + 240 = 950 vehicles. The third totals 250 + 260 + 240 + 210 = 960 vehicles. The largest one-hour volume within the given record is therefore 960 vehicles.
వివరణ:
Question 11
ప్రశ్న 11
During an analysis hour, 780 vehicles travel eastbound and 520 westbound on an undivided road. What is the major-direction traffic percentage of the two-way hour total?
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Explanation:
The two-way hourly volume is 780 + 520 = 1,300 vehicles. The eastbound direction is the larger component. Its share is 780 divided by 1,300. Multiplying the ratio by 100 gives 60 percent. The observed directional distribution is thus 60:40 and may vary by time of day and location.
వివరణ:
Question 12
ప్రశ్న 12
A classified count records 500 motorcycles, 300 cars, 150 buses and 50 trucks. What percentage of the observed physical vehicles consists of buses, without any PCU conversion?
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Explanation:
The total physical vehicle count is 500 + 300 + 150 + 50 = 1,000. Buses contribute 150 vehicles to this total. Their percentage is 150/1,000 times 100. The result is 15 percent. Traffic composition in physical vehicle percentages must be distinguished from composition weighted using passenger-car-unit factors.
వివరణ:
Question 13
ప్రశ్న 13
For a specified illustrative traffic-analysis exercise, a count contains 300 cars, 240 motorcycles, 100 trucks and 80 autorickshaws. Take the assumed PCU factors respectively as 1.0, 0.5, 2.5 and 1.25. What is the total PCU-equivalent count?
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Explanation:
Multiply each observed class count by its explicitly supplied PCU factor. Cars contribute 300 PCU and motorcycles contribute 120 PCU. Trucks contribute 250 PCU and autorickshaws contribute 100 PCU. The sum is 300 + 120 + 250 + 100 = 770 PCU. The given conversion factors are assumptions for this exercise and should not be taken as universally fixed Indian standard values.
వివరణ:
Question 14
ప్రశ్న 14
Which statement about passenger-car-unit factors on mixed-traffic urban roads is consistent with IRC:86-2018?
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Explanation:
A PCU represents the relative interaction of a vehicle type with the traffic stream compared with a passenger car. Vehicle dimensions and operating speeds contribute to this effect. Traffic composition and volume can also change interaction and manoeuvring opportunities. IRC:86-2018 consequently does not treat all PCU factors as invariant across every road condition. Analysts should retain actual classified counts and document the factors applied to a particular assessment.
వివరణ:
Question 15
ప్రశ్న 15
Two roads each carry exactly 1,000 physical vehicles during an hour. Road P has 800 cars and 200 trucks; Road Q has 500 cars and 500 trucks. Assume cars = 1 PCU and trucks = 2.5 PCU for this exercise. How much greater is Road Q's PCU-equivalent flow?
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Explanation:
Road P has 800 + 200 times 2.5 = 1,300 PCU in the hour. Road Q has 500 + 500 times 2.5 = 1,750 PCU. Their physical vehicle volumes are equal at 1,000 vehicles per hour. The PCU-equivalent difference is 1,750 - 1,300 = 450 PCU per hour. This illustrates why traffic composition matters when evaluating mixed-vehicle demand.
వివరణ:
Question 16
ప్రశ్న 16
For a planning exercise, a highway has AADT = 24,000 vehicles/day, a supplied design-hour proportion K = 0.10 and peak-direction fraction D = 0.65. Using directional design-hour volume = AADT times K times D, what is the directional demand?
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Explanation:
The design-hour proportion gives the total two-way selected hourly volume. Multiplying 24,000 by 0.10 produces 2,400 vehicles per hour. The peak direction is assumed to carry 65 percent of that amount. Multiplying 2,400 by 0.65 gives 1,560 vehicles per hour. The result is a directional planning volume and not a physical count taken at the site during that specific hour.
వివరణ:
Question 17
ప్రశ్న 17
A site shows an approach count of 900 vehicles in one hour, but a standing queue grows during part of the observation because arrivals exceed its discharge capacity. Which interpretation is most defensible?
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Explanation:
A queue grows when vehicle arrivals exceed departures over a period. A downstream count primarily measures the number of vehicles discharged past that point. Some vehicles that arrived during the period may still be waiting at its end. Observed discharge may therefore be less than the incoming demand when the queue grows. Reliable congested-flow analysis should consider count location, queue accumulation and the difference between arrival and departure flows.
వివరణ:
Question 18
ప్రశ్న 18
For a homogeneous road section under approximately steady conditions, the observed traffic density is 40 vehicles/km and the space-mean speed is 45 km/h. Using q = kv, what is the corresponding traffic flow rate?
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Explanation:
The fundamental traffic-stream relation is q = kv under consistent space-time definitions. Density k is 40 vehicles per kilometre. The applicable space-mean speed is 45 kilometres per hour. Their product is 40 times 45 = 1,800 vehicles per hour. The relation should not be applied using an incompatible speed definition or unrelated observations from different road sections.
వివరణ:
Question 19
ప్రశ్న 19
A 60-minute classified traffic count has 350 cars, 200 motorcycles, 70 light commercial vehicles and 30 buses. For this question assume PCU factors of 1.0, 0.5, 2.0 and 3.0 respectively. What is the equivalent hourly demand?
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Explanation:
Cars contribute 350 multiplied by 1.0 = 350 PCU. Motorcycles contribute 200 multiplied by 0.5 = 100 PCU. Light commercial vehicles contribute 70 multiplied by 2.0 = 140 PCU. Buses contribute 30 multiplied by 3.0 = 90 PCU. The total is 350 + 100 + 140 + 90 = 680 PCU per hour under the stated factors.
వివరణ:
Question 20
ప్రశ్న 20
A traffic observer counts 10,000 vehicles between 06:00 and 18:00, while an automatic logger records another 2,000 vehicles between 18:00 and 06:00 on the same counting day. Which interpretation is correct?
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Explanation:
The daytime record contains 10,000 vehicles over the stated 12 hours. The logger records a further 2,000 vehicles during the remaining 12 hours. The full observed day therefore contains 12,000 vehicles. Doubling the daytime count would incorrectly produce 20,000 vehicles. Short-duration extrapolation requires evidence about the actual time-of-day distribution rather than an automatic equal split.
వివరణ:
Question 21
ప్రశ్న 21
A pneumatic-tube axle counter records 1,080 axle strikes. Independent classification confirms that 420 two-axle vehicles and 80 three-axle vehicles caused all strikes, with no missing or repeated detections. How many actual vehicles passed?
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Explanation:
The two-axle group produced 420 times two = 840 axle strikes. The three-axle group produced 80 times three = 240 axle strikes. Together they account for the stated total of 1,080 strikes. The actual number of vehicles is 420 + 80 = 500. This illustrates why axle-detection data need classification or axle-correction procedures before they are interpreted as vehicle counts.
వివరణ:
Question 22
ప్రశ్న 22
A road has an AADT of 18,000 vehicles/day and a selected design-hour two-way volume of 1,800 vehicles/h. What is the design-hour volume expressed as a percentage of AADT, commonly called the K-factor in this calculation?
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Explanation:
The K-factor is the specified hourly volume divided by the annual average daily traffic. Dividing 1,800 by 18,000 gives 0.10. Expressing that fraction as a percentage yields 10 percent. This relates the chosen design hour to the annual-average daily volume. It does not imply that every hour of the day carries 10 percent of daily traffic.
వివరణ:
Question 23
ప్రశ్న 23
Two approaches each record 1,000 vehicles during their busiest hour. Approach P has a maximum 15-minute count of 250, while approach Q has a maximum 15-minute count of 400. What does the peak-hour-factor comparison show?
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Explanation:
Peak-hour factor is hourly volume divided by four times the maximum 15-minute volume. For P it is 1,000/(4 times 250) = 1.000. For Q it is 1,000/(4 times 400) = 0.625. A lower PHF indicates greater concentration within the busiest short interval. Thus Q has more uneven peak-hour flow despite having the same one-hour volume as P.
వివరణ:
Question 24
ప్రశ్న 24
At one approach to a signalized four-leg junction, a classified turning-movement count records 600 entering vehicles in an hour, including 90 right turns and 120 left turns. Assuming all remaining vehicles proceed straight and no U-turns occur, how many are through vehicles?
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Explanation:
The approach total is the sum of right-turning, left-turning and through movements under the stated assumptions. Right turns contribute 90 vehicles. Left turns contribute 120 vehicles. Subtracting both turning components from 600 leaves 600 - 90 - 120 = 390 through vehicles. Such movements must be recorded by approach and turning direction for meaningful intersection design.
వివరణ:
Question 25
ప్రశ్న 25
A seven-day traffic count was taken during an unusual local festival on a road with marked seasonal and directional traffic changes. Which action gives the most defensible basis for estimating ordinary annual road demand?
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Explanation:
Short-duration surveys describe traffic during the period actually observed. Festivals and seasons can produce atypical traffic volumes and vehicle composition. Directional imbalance can also change according to travel purpose and time. Estimates of ordinary annual conditions should therefore use suitable adjustment evidence and documented assumptions. Keeping the original observations permits later review and prevents a biased sample from being presented as an exact annual average.
వివరణ:
Answer Key సమాధానాల పట్టిక
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Question 1 ప్రశ్న 1Answer: C. The observed volume is 720 vehicles in 30 minutes, and the equivalent rate is 1,440 vehicles/h if the observed rate is maintained. సమాధానం: C.
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Question 2 ప్రశ్న 2Answer: A. A classified directional traffic-volume count recording each vehicle category over consistent time intervals. సమాధానం: A.
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Question 3 ప్రశ్న 3Answer: D. Use an appropriate automatic traffic counter/classifier or video-based system, with field calibration and quality checks for the local traffic mix. సమాధానం: D.
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Question 4 ప్రశ్న 4Answer: B. At a representative section away from major entry/exit points that alter its traffic stream, with separate direction and vehicle-class records. సమాధానం: B.
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Question 5 ప్రశ్న 5Answer: C. 5,000 vehicles/day. సమాధానం: C.
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Question 6 ప్రశ్న 6Answer: A. Approximately 7,143 vehicles/day. సమాధానం: A.
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Question 7 ప్రశ్న 7Answer: D. 6,900 vehicles/day. సమాధానం: D.
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Question 8 ప్రశ్న 8Answer: B. 0.833. సమాధానం: B.
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Question 9 ప్రశ్న 9Answer: A. 1,680 vehicles/h. సమాధానం: A.
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Question 10 ప్రశ్న 10Answer: C. 960 vehicles. సమాధానం: C.
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Question 11 ప్రశ్న 11Answer: B. 60%. సమాధానం: B.
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Question 12 ప్రశ్న 12Answer: D. 15%. సమాధానం: D.
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Question 13 ప్రశ్న 13Answer: A. 770 PCU. సమాధానం: A.
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Question 14 ప్రశ్న 14Answer: C. Relative PCUs can vary with vehicle size, operational speed, traffic composition, volume and roadway conditions. సమాధానం: C.
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Question 15 ప్రశ్న 15Answer: B. 450 PCU/h. సమాధానం: B.
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Question 16 ప్రశ్న 16Answer: D. 1,560 vehicles/h. సమాధానం: D.
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Question 17 ప్రశ్న 17Answer: A. The measured discharge count may understate arriving demand while the queue grows, so arrivals and departures should be distinguished. సమాధానం: A.
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Question 18 ప్రశ్న 18Answer: C. 1,800 vehicles/h. సమాధానం: C.
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Question 19 ప్రశ్న 19Answer: B. 680 PCU/h. సమాధానం: B.
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Question 20 ప్రశ్న 20Answer: D. The observed 24-hour total is 12,000 vehicles, demonstrating that simply doubling a 12-hour count would overestimate this day's flow. సమాధానం: D.
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Question 21 ప్రశ్న 21Answer: A. 500 vehicles. సమాధానం: A.
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Question 22 ప్రశ్న 22Answer: C. 10%. సమాధానం: C.
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Question 23 ప్రశ్న 23Answer: B. P has PHF 1.000 and Q has PHF 0.625, so Q has the stronger short-interval concentration. సమాధానం: B.
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Question 24 ప్రశ్న 24Answer: D. 390 vehicles. సమాధానం: D.
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Question 25 ప్రశ్న 25Answer: A. Check representativeness, retain classified and directional records, and apply justified seasonal or other adjustments using suitable continuous-count evidence. సమాధానం: A.