A super -elevation e is provided on a circuler horizontal curve such that a vehical can be sttoped on the curve without sliding Assuming a design v and maximum cofficient of side friction f_{max}_{,} which one of the following critearea should be satisfied?
A runway is being constructed in a new airport as per the International Civil Aviation Organization (ICAO) recommendations. The elevation and the airport refrence temprature of this airport are 535 m above the mean sea level and $\style{font-family:'Times New Roman'}{22.65^\circ}$ respectively. Consider the effective gradient of runway as 1%. The length of runway required for a design-aircraft under the standaed conditions is 2000 m. Within the framework of applynig sequential corrections as per the ICAO recommendations, the length of runway corrected for the temprature is.
The radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full friction is assumed to developed), and the value of coefficient of friction needed (if no superelevation is provided) will, respectively, be
For a broad gauge railway track on a horizontal curve of radius R (in m) the equlibrium cant e required for a train moving at a speed of V (in km per hour) is
The VPI (vertical point of intersection) is 100 m away (when measured along the horizontal) form the VPC (vertical point of curvature). If the vertical curve is parabolic, the length of the curve (in meters and measured along the horizontal) is _____________
While aligning a hill road with a ruling gradient of 6%, a horizontal curve of radius of 50 m is encountered. The grade compensation (in percentage, up to two decimal places) to be provided for this case would be ____________.
A two lane, one-way road with radius of 50 m is predominantly carrying lorries with wheelbase of 5 m. The speed of lorries is restricted to be between 60 kmph and 80 kmph. The mechanical widening and psychological widening required at 60 kmph are designated as W_{me},_{60} and W_{ps},_{60} , respectively. The mechanical widening and psychological widening required at 80 kmph are designated as W_{me,80} and W_{ps,}_{80 }, respectively. The correct values of Wme ,60 , W_{ps} ,_{60}, W_{me} ,_{80 },W_{ps} ,_{80 }, respectively are
A motorist traveling at 100 km/h on a highway needs to take the next exit, which has a speed limit of 50 km/h. The section of the roadway before the ramp entry has a downgrade of 3% and coefficient of friction ( f ) is 0.35. In order to enter the ramp at the maximum allowable speed limit, the braking distance (expressed in m) from the exit ramp is _________
On a circular curve, the rate of superelevation is e. While negotiating the curve a vehicle comes to a stop. It is seen that the stopped vehicle does not slide inwards (in the radial direction). The coefficient of side friction is f. Which of the following is true:
A sign is required to be put up asking drivers to slow down to 30 km/h before entering Zone Y (see figure). On this road, vehicles require 174 m to slow down to 30 km/h ( the distance of 174 m includes the distance travelled during the perception – reaction time of drivers). The sign can be read by 6/6 vision drivers from a distance of 48 m. The sign is placed at a distance of x m from the start of Zone Y so that even a 6/9 vision driver can slow down to 30 km/h before entering the zone. The minimum value of x is ________ m.
A superspeedway in New Delhi has among the highest super-elevation rates of any track on the Indians Grand Prix circuit. The track requires drivers to negotiate turns with a radius of 335 m and 33^{o} banking. Given this information, the coefficient of side friction required in order to allow a vehicle to travel at 320 km/h along the curve is :
The following statements are related to temperature stresses developed in concrete pavement slabs with free edges (without any restraint):
P. The temperature stresses will be zero during both day and night times if the pavement slab is considered weightless Q. The temperature stresses will be compressive at the bottom of the slab during night time if the self-weight of the pavement slab is considered R. The temperature stresses will be compressive at the bottom of the slab during day time if the self-weight of the pavement slab is considered
The TRUE statement(s) is(are)
A traffic survey conducted on a road yields an average daily traffic count of 5000 vehicles. The axle load distribution on the same road is given in the following table:
The design period of the road is 15 years, the yearly traffic growth rate is 7.5% and the load safety factor (LSF) is 1.3. If the vehicle damage factor (VDF) is calculated from the above data, the design traffic (in million standard axle load, MSA) is ____________
The perception-reaction time for a vehicle travelling at 90 km/h, given the coefficient of longitudinal friction of 0.35 and the stopping sight distance of 170 m (assume g = 9.81 m/s^{2}), is _____________ seconds.
A road is being designed for a speed of 110 km/hr on a horizontal curve with a super elevation of 8%. If the coefficient of side friction is 0.10, the minimum radius of the curve (in m) required for safe vehicular movement is
In a Marshall sample, the bulk specific gravity of mix and aggregates are 2.324 and 2.546 respectively. The sample includes 5% of bitumen (by total weight of mix) of specific gravity 1.10. The theoretical maximum specific gravity of mix is 2.441. The void filled with bitumen (VFB) in the Marshall sample (in %) is ___________
For two major roads with divided carriageway crossing at right angle,a full clover leaf interchange with four indirect ramps is provided. Following statements are made on turning movements of vehiclesto all directions from both roads. Identify the correct statement:
For a portion of national highway where a descending gradient of 1 in 25 meets with an ascending gradient of 1 in 20, a valley curve needs to be designed for a vehicle travelling at 90 kmphbased on the following conditions.
(i) headlight sight distance equalto the stopping sight distance (SSD) of a level terrain consideringlength of valley curve> SSD. (ii) comfort condition with allowablerate of change of centrifugal acceleration = 0.5 m/sec^{3}.
Assume total reaction time = 2.5 seconds; coefficient of longitudinal friction of the pavement= 0.35; height of head light of the vehicle =0.75 m; andbeam angle = 1°.
What is the length of valley curve (in m) based on the head light sight distance condition? __________
What is the length of valley curve (in m)based on the comfort condition? __________
Two bitumen samples “X” and “Y” have softening points 45$\xb0$C and 60$\xb0$C, respectively. Consider the following statements:
I Viscosity of “X” will be higher than that of “Y” at the same temperature.
II Penetration value of “X” will be lesser than that of “Y” under standard conditions.
The CORRECT option evaluating the above statements is
Road roughness is measured using
A pavement designer has arrived at a design traffic of 100 million standard axles for a newly developing national highway as per IRC:37 guidelines using the following data: design life = 15 years, commercial vehicle count before pavement construction = 4500 vehicles/day, annual traffic growth rate = 8%. The vehicle damage factor used in the calculation was
The following data are related to a horizontal curved portion of a two-lane highway: length of curve = 200 m, radius of curve = 300 m and width of pavement = 7.5 m. In order to provide a stopping sight distance (SSD) of 80 m, the set back distance (in m) required from the centre line of the inner lane of the pavement is
In marshall testing of bituminous mixes, as the bitumen content increases the flow value
If v is the initial speed of a vehicle, g is the gravitational acceleration, G is the upward longitudinal slope of the road and f_{r} is the coefficient of rolling friction during braking the braking distance(measured horizontally) for the vehicle to stop is
Aggregate impact value indicales the following property of Aggregates
Consider the following statements in the context of geometric design of roads.
I: A simple parabolic curve is an acceptable shape for summit curves
II: Comfort to passengers is an important consideration in the design of summit curves
The correct option evaluating the above statements and their relationship is
The design speed for a two-lane road is 80 kmph. When a design vehicle with a wheelbase of 6.6 m is negotiating a horizontal curve on that road, the off-tracking is measured as 0.096 m. The required widening of carriageway of the two-lane road on the curve is approximately
The value of lateral friction or side friction used in the design of horizontal curve as per India Roads Congress guidelines is
A crest vertical curve joins two gradients of +3% and -2% for a design speed of 80km/h and the corresponding stopping sight distance of 120m. The height of driver’s eye and the object above the road surface are 1.20m and 0.15m respectively. The curve length (which is less than stopping sight distance) to be provided is
The specific gravity of paving bitumen as per IS:73 – 1992 lies between
A combined value of flakiness and elongation index is to be determined for a sample of aggregates. The sequence in which the two tests are conducted is
It is proposed to widen and strengthen an existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found to be 4 percent. Given : traffic growth rate for CV = 8 percent, vehicle damage factor = 3.5 (standard axles per CV), design life = 10 years and traffic distribution factor = 0.75. The cumulative standard axles (msa) computed are
A horizontal circular curve with a centre line radius of 200 m is provided on a 2-lane, 2-way SH section. The width of the 2-lane road of 7.0 m. Design speed for this section is 80 km per hour. The brake reaction time is 2.4 s, and the coefficients of friction in longitudinal and lateral directions are 0.355 and 0.15, respectively.
The safe stopping sight distance on the section is
The set-back distance from the centre line of the inner lane is
The consistency and flow resistance of bitumen can be determined from the following:
The extra widening required for a two-lane national highway at a horizontal curve of 300 m radius, considering a wheel base of 8 m and a design speed of 100 kmph is
While designing a hill road with a ruling gradient of 6%, if a sharp horizontal curve of 50 m radius is encountered, the compensated gradient at the curve as per the Indian Roads Congress specifications should be
The design speed on a road is 60 kmph. Assuming the driver reaction time of 2.5 seconds and coefficient of friction of pavement surface as 0.35, the required slopping distance for two-way traffic on a single lane road is
The following data pertains to the number of commercial vehicles per day for the design of a flexible pavement for a national highway as per IRC:37-1984:
Assuming a traffic growth factor of 7.5% per annum for both the types of vehicles, the cumulative number of standard axle load repetitions (in million) for a design life of ten years is
Match the following tests on aggregate and its properties.