Question

highway geometric

Q1) A. What are the Principal elements of the highway cross section? Draw the typical cross sections for a two-lane highway. (5 Points) B. Briefly discuss the various indirect design factors to be considered for geometric design of highway. (10 Points) Q2) A. What is Road Alignment? Briefly describe the requirements of an ideal alignment. (5 Points) B. An equal-tangent sag vertical curve has the initial grade is -3.2% and the final grade is +1.8%, PVI at 30+30 and elevation 465.92 and station of EVC is 31+80. Compute: (15 Points) 1. Elevations and grades at full stations. 2. Station and elevation of the curve's highest and lowest points. The curve for stakeout at full 100ft stations, (3) A. Two tangents intersect at a deflection angle= 35° at station I= 23+20. These tangents are to be connected by two similar transition curves 75m long and a circular curve, with radius 300m. Calculate stations TS,SC,CS, and ST. (5 Points) B. A Simple horizontal curve having A-40°, station P.I= 12+00, given a design (operating) speed of 100 km/hr and maximum superelevation of 4% and fs =0.12, 2 lane 2 way highway, Lane width=3.3m, Cross slope=1.5%, Maximum relative gradient=0.62%, 1. Find the deflection angle and setting out the curve and dividing the arc into 50 m stations. 2. Find the length of tangent runout, and draw the profile with the station of beginning and ending of superelevation runoff and tangent runout? (15 Points)

Answer 1

A PRINCIPAL ELEMENTS HIGHWAY WAY 1) CARRIAGE The width of pavement pavement way which vehicles traukt is carriage way. 2) FORMATION WIDTH Top of width highway embankment excluding the side drain of the 3 RIGHT OF WAY land Area of required for the road along alignment 4 5 ROAD SHOULDER Emergency lane for Vehicles. Side SLOPE The slope of earthwork in filling or cutting BERM Distance bo road toe & the inner edge of borrow pit 6 SIDE DRAIN Drains are on either side of road provided for drainage' of rainwater 8 BUILDING LINE Distance from the centreline of wad on either side, within which construction is not permitted 9 KERBS Boundary blea footpath. pavement & shoulders or Formation width. X Building Line BERM shoulder I corriage Carriage way. DISTANCE side slope. t DRAIN 2 LANE C Ross-section of ROAD. B OF AREA 2) 4 TOPOGRAPHY FRICTION Crucial factor in the design of horizontal cwives. 4 ENVIRONMENTAL FACTORS ECONOMICAL FACTORS Properties of VEHICAL HUMAN ( MINDSET OF DRIVER). 5 6 Scanned with CamScanner

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