er the followings (Write down your answers on the answer shest in the ercings o
ID: 1742554 • Letter: E
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er the followings (Write down your answers on the answer shest in the ercings o Selection of a particular highway location is usually based on four elements Name twor 2) The measurement of distances and elevations by using devices located above the earth, such as airplanes or orbiting satellites using Global Positioning Satellite systems (GPS) is 3) When drawing the Plan and Profile of a highway 4) The plan shows the alignments 5) The profile shows the A car was traveling at 50 mph on a level terrain. When the car was at station (43+70, the alignments driver saw an accident [I full station is 100 ft and f-a/- 0.3478 6) Using the default stopping PRT, he will start his brakes at station 7) The car will reach a speed of 30 mph ft after he starts the brakes The minimum radius of a horizontal alignment (R) depends on the speed, superelevation and side friction. 8) R depends inversely on The PRT process through which a driver, cyclist or pedestrian evaluates and reacts to a stimulus can be divided into four sub-processes. Name two of them: 9) 0) Simple circular curve has -16 38, D,-5 43, and Pl Su -6+26) (Fl Station-100 ft.). Find: 11) External Distance 12) PC Sta Superelevation was atained using the 1/3 and 23 rule to the 4 lane road with maximum relative gradient of 0.45. Adjusted factor for number of lane is 075, normal crown is 2% and full superelevation is 6% Ifthe PC Sa-O2I+09), lane widh-12 and Full Suton . 100 ft, then the station where 13) Normal Crown ends is 14) Run-off starts is 15) Run-off ends is In Amman, it was decided to put a sign welcoming visitors as they enter the city on Alrport Street. As Airpont Street enters Amman, it has six 12-foot lanes with 4-foot inner shouldes Unfortunately, it is also flat a horizontal curve with a tadius of 1400 feet. The speed linit is 60 mph. The sign nceds to be placed at a distance (d) from the inner shoulder wand the center of the curve so as to avoid potential stopping sight distance problems.(f-0.35, PRT-27sExplanation / Answer
4 elements based on which the highway location is seleced:
1)length of the road between the the two terminal points should be minimum.
2)topgraphy of the survey should also be considered i.e number of curves and eathwork should be minimum.
no.of cross drainage elements should be minimum
connect as many villags ,cities as possible.
3)the measurment of distance and elevations by using devices located above the earthsuch as airplanesor orbititng satellitesusing Global Positioning Satellite System is called as aerial survey.by using this survey the topography of the land is determined and also the type of land.
4)the plan of a highway shows the horizontal alignment the horizontal alignment includes the horizontal curve and tangents,i.e the alignment which shows the top view and its route is known as its plan.
5) the profile of the highway shows the vertical aspects of the highway such as vertical curves and sag curve.
6)given data:
speed of the car v = 50mph
car at station 43+70 and saw accident,f=0.3478.
stopping PRT ,he starts his breaks at station =
dprt = 0.278*V*t
where V = speed in mph and t= perception reaction time of a driver and it is equal to 2.5 sec.
dprt = 0.278*50*2.5 = 34.75 ft
hence he will starts breaks at station 43+70+34.75ft =44+047 ft(1 full station = 100ft)
7)station at which 30mph after application of breaks:
DMT = 1.075*V2/a
where DMT = breaking distance
V = design speed 30 mph
a = decceleration 11.2 ft2/sec
DMT = 1.075*302/11.2 = 86.38ft
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