Test 14 - At-Grade Intersections

Question 1 ప్రశ్న 1

Two public roads intersect at approximately the same elevation, and their turning and crossing traffic movements are accommodated within a common junction area. Which classification correctly describes this arrangement?

A A grade-separated interchange because vehicles can change their direction of travel. B An at-grade intersection because the conflicting road movements are accommodated substantially at the same level. C A fully access-controlled interchange because the roads are publicly maintained. D A grade-separated crossing because the intersecting roads have different traffic volumes.

Question 2 ప్రశ్న 2

A highway engineer compares a T-intersection and a Y-intersection involving three road approaches. Which statement most accurately distinguishes these layouts?

A A T-intersection necessarily has four approaches, whereas a Y-intersection has three. B A Y-intersection is always grade-separated, while a T-intersection is always at-grade. C A T-intersection cannot accommodate right turns, whereas a Y-intersection can. D Both have three legs, but a T-intersection normally has a side road meeting a continuing road, while a Y-intersection has a fork-like arrangement of the approaches.

Question 3 ప్రశ్న 3

An existing Y-intersection has a severely acute approach angle, and drivers entering the major road experience difficulty observing approaching vehicles. Which geometric improvement is most directly justified?

A Realign the affected approach towards a more nearly perpendicular intersection angle where feasible, while checking sight distance and turning requirements. B Increase the acute skew while retaining the existing sight obstructions. C Enlarge the paved conflict area without defining the paths of turning vehicles. D Increase approach speeds to reduce the time vehicles spend within the intersection.

Question 4 ప్రశ్న 4

Two minor-road approaches meet opposite sides of a major road at separate nearby locations instead of forming one four-leg junction. Which term describes this arrangement?

A A grade-separated interchange. B A conventional four-leg cross intersection with coincident minor-road centrelines. C A staggered intersection consisting of two offset three-leg junctions. D A three-level intersection with separated crossing movements.

Question 5 ప్రశ్న 5

Five roads converge at one at-grade location, creating a large paved area with unclear turning paths. Which preliminary engineering response is most appropriate?

A Retain all unrestricted movements without examining the increased number of conflict opportunities. B Investigate geometric simplification, possible realignment or separation of approaches, and suitable traffic control based on turning demand and safety. C Increase all approach speeds so vehicles clear the common paved area more quickly. D Use the same intersection geometry as a conventional three-leg junction without considering the additional approaches.

Question 6 ప్రశ్న 6

Consider three traffic movements at an at-grade intersection: Movement P separates from a common traffic stream, Movement Q joins another traffic stream, and Movement R crosses an intersecting stream. Which classification is correct?

A P – diverging; Q – merging; R – crossing. B P – merging; Q – diverging; R – crossing. C P – crossing; Q – merging; R – diverging. D P – diverging; Q – crossing; R – merging.

Question 7 ప్రశ్న 7

Under the conventional theoretical conflict-point model, how many vehicle conflict points are present at an unrestricted four-leg, two-way, at-grade intersection with all ordinary turning movements permitted and no special channelization?

A 9 conflict points. B 16 conflict points. C 24 conflict points. D 32 conflict points.

Question 8 ప్రశ్న 8

Under the conventional theoretical model for a simple unrestricted three-leg T-intersection, what is the total number of vehicle conflict points?

A 6 conflict points. B 12 conflict points. C 9 conflict points. D 16 conflict points.

Question 9 ప్రశ్న 9

For an unrestricted conventional four-leg intersection having 32 theoretical vehicle conflict points, which combination correctly identifies the crossing, merging and diverging conflict points, respectively?

A 16 crossing, 8 merging and 8 diverging. B 8 crossing, 16 merging and 8 diverging. C 8 crossing, 8 merging and 16 diverging. D 12 crossing, 10 merging and 10 diverging.

Question 10 ప్రశ్న 10

In the conventional conflict-point model, an unrestricted four-leg intersection has 32 potential vehicle conflict points and an unrestricted three-leg intersection has 9. How many more potential conflict points does the four-leg arrangement have?

A 17 conflict points. B 23 conflict points. C 25 conflict points. D 41 conflict points.

Question 11 ప్రశ్న 11

A simplified intersection-design illustration shows 32 theoretical conflict points for an unrestricted four-leg junction and 16 conflict points for its specified two-phase signal-controlled arrangement. What is the percentage reduction between the two illustrated conflict-point counts?

A 25%. B 33.3%. C 50%. D 75%.

Question 12 ప్రశ్న 12

A conventional unrestricted T-intersection has 9 theoretical vehicle conflict points, of which 3 are crossing points. What percentage of its theoretical conflict points are crossing conflicts?

A 25%. B 50%. C 66.7%. D Approximately 33.3%.

Question 13 ప్రశ్న 13

A four-leg intersection is proposed to be replaced with two staggered T-intersections on a busy urban corridor. Which assessment is most technically defensible?

A The staggered arrangement will always eliminate all crossing, merging and diverging conflicts. B Staggering may simplify individual junction conflicts, but the offset distance, intermediate turning flows, storage and interaction between the junctions must be examined. C The two T-intersections can be considered completely independent regardless of how closely they are spaced. D The arrangement is necessarily unsafe because every staggered intersection has more conflict points than an unrestricted five-leg intersection.

Question 14 ప్రశ్న 14

An engineer proposes raised channelizing islands at a broad, uncontrolled intersection. What is their principal traffic-engineering function when properly designed?

A To guide movements into defined paths, separate selected conflicts spatially and reduce ambiguous paved areas. B To eliminate the need to check pedestrian movements and design-vehicle turning paths. C To guarantee that every vehicle can pass through the intersection without deceleration. D To replace all priority-control requirements regardless of traffic volumes and visibility.

Question 15 ప్రశ్న 15

A low-volume minor road meets a higher-volume major road at an unsignalized T-intersection. Which traffic-control principle is most appropriate when priority control is justified by the site conditions?

A Assign equal priority to every movement even when conflicting traffic streams require a defined right of way. B Require the major-road through traffic to stop for every minor-road vehicle regardless of the selected priority arrangement. C Allow minor-road vehicles to enter without considering the available gaps in major-road traffic. D Use suitable STOP or GIVE WAY control on the minor-road approach, supported by adequate visibility and geometric design.

Question 16 ప్రశ్న 16

For an illustrative intersection sight-distance calculation, a major-road vehicle travels at a constant 60 km/h. A minor-road vehicle requires a specified gap of 7 seconds to complete its entry manoeuvre. Neglecting all additional allowances, what distance does the major-road vehicle travel during this gap?

A 96.0 m. B 105.0 m. C Approximately 116.7 m. D Approximately 151.2 m.

Question 17 ప్రశ్న 17

At a minor-road STOP-controlled junction, parked vehicles and a roadside advertising structure obstruct a driver's view of approaching major-road traffic. What should the intersection-safety investigation prioritize?

A Examine and restore the required sight triangle while checking approach geometry and traffic-control visibility. B Increase the minor-road approach speed to reduce the time spent within the intersection. C Relocate the STOP line farther into the major-road carriageway without checking safety consequences. D Increase the roadway grade on the minor approach solely to provide a higher driver position.

Question 18 ప్రశ్న 18

A dedicated turning lane at an intersection must store an estimated queue of 12 passenger cars. For this simplified design exercise, assume an effective standing length of 6.5 m per car, including its share of the intervehicle gap. What is the minimum queue-storage length, excluding taper and deceleration requirements?

A 65 m. B 72 m. C 84 m. D 78 m.

Question 19 ప్రశ్న 19

During a peak-hour turning-movement survey, one intersection approach carries 250 cars, 70 buses and 30 trucks. For this numerical exercise, assume passenger-car-equivalent factors of 1.0, 2.5 and 3.0 for cars, buses and trucks, respectively. What is the equivalent approach flow?

A 350 PCU/h. B 425 PCU/h. C 515 PCU/h. D 605 PCU/h.

Question 20 ప్రశ్న 20

A four-leg signalized intersection on a left-hand-traffic road experiences repeated collisions between right-turning vehicles and opposing through vehicles. Which operational improvement most directly addresses the identified crossing conflict?

A Increase the right-turning speed without modifying signal control. B Investigate protected right-turn signal phases or other suitable arrangements that separate the conflicting movements in time. C Permit right-turning vehicles to enter the opposing traffic stream whenever the intersection appears congested. D Increase only the width of the downstream through lane without checking the right-turn conflict.

Question 21 ప్రశ్న 21

For a simplified unsignalized-intersection gap-acceptance exercise, the assumed minimum acceptable gap for a minor-road manoeuvre is 7.5 seconds. Three successive available gaps in the conflicting stream are 7.0, 8.0 and 6.0 seconds. Under a deterministic rule accepting only gaps at least equal to 7.5 seconds, which gap is acceptable?

A Only the 8.0-second gap. B Both the 7.0-second and 8.0-second gaps. C All three gaps because each is longer than 5 seconds. D None of the gaps because the minimum is 7.5 seconds.

Question 22 ప్రశ్న 22

At a priority-controlled T-intersection, the minor-road entry movement depends on acceptable gaps in major-road traffic. If major-road conflicting flow increases substantially while the geometry and gap-acceptance characteristics remain unchanged, what is the expected general effect?

A The minor-road movement receives more acceptable gaps and its capacity necessarily increases. B Major-road traffic volume has no influence on minor-road capacity at a priority-controlled intersection. C Acceptable entry opportunities generally become less frequent, tending to reduce minor-road entry capacity and increase delay. D The minor-road traffic automatically receives priority without any change to signs or control.

Question 23 ప్రశ్న 23

A junction improvement proposes increasing the corner radius to accommodate frequent large trucks, but the intersection also serves many pedestrians. Which design judgement best balances these requirements?

A Use the largest possible radius regardless of pedestrian crossing distance and vehicle speed. B Use the smallest possible radius even if the design trucks cannot complete their turns within a safe swept path. C Remove marked pedestrian crossings because large turning vehicles require additional space. D Check design-vehicle swept paths and provide an appropriate corner treatment while limiting unnecessary crossing width and turning speed.

Question 24 ప్రశ్న 24

A peak-hour survey of one intersection approach records 180 left-turning vehicles, 420 through vehicles and 200 right-turning vehicles. What percentage of the approach flow consists of turning vehicles?

A 22.5%. B 47.5%. C 52.5%. D 57.5%.

Question 25 ప్రశ్న 25

A municipal authority must select an appropriate improvement for an existing at-grade intersection with increasing traffic demand, pedestrian activity and a history of angle and turning collisions. Which study-and-selection procedure is most defensible?

A Evaluate classified approach and turning flows, crash patterns, sight distance, pedestrian demand, design-vehicle paths, capacity and feasible control or geometric alternatives before selecting a treatment. B Select the arrangement with the smallest construction cost without evaluating traffic conflicts, operating conditions or safety. C Widen every approach equally without examining whether the critical problem involves turning conflicts or pedestrian crossing movements. D Provide unrestricted simultaneous movements on all approaches to eliminate the need for priority or signal control.

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