Question

A horizontal curve on a two lane road is 175 ft long and has a radius of 500 ft to the center of the road. There is a tree 24 ft from the edge of the road in the middle of the curve. The lanes of the road are 12 ft wide each. What is the sight distance available through this curve? Recommend a maximum safe speed limit (within 5 mph) for this curve.

Answer #1

ou are asked to design a horizontal curve for a two-lane road.
The road has 12-ft lanes. Due to expensive excavation, it is
determined that a maximum of 35 ft can be cleared from the road’s
centerline toward the inside lane to provide for stopping sight
distance. Also, local guidelines dictate a maximum superelevation
of 0.08 ft/ft.
Determine the design speed for this curve (mph)?

A horizontal curve of radius 5620 ft is designed for 60 mph. The
roadway is a 4-lane undivided highway with 12-ft lanes. A tree is
located on the inside of the curve only 42 ft from the center of
the road. Does it pose a stopping sight distance problem for the
drivers travelling at the design speed? Show all supporting
calculations.

A horizontal curve on a three-lane highway with 12-ft lanes has
a PC located at station 10+00 and PT at station 13+70. The central
angle is 25 degrees, the superelevation is 4%, and 40 ft of
clearance is available between an obstruction and the centerline.
Determine the maximum safe design speed to the nearest 5 mph.

A horizontal curve is being designed for a new four-lane roadway
with 11-ft lanes. The PT is located at station 1050+20, the design
speed is 45 mph and maximum superelevation of 4%. If the central
angle of the curve is 30 degrees, what is the radius of the curve
and location of the PC and PI?

1. A horizontal curve on a two-lane highway is designed with a
2000 ft radius, 12 ft lanes, and 60mph design speed. Determine the
distance that must be cleared from the inside edge of the inside
lane to provide a sufficient stopping sight distance.
2, A flexible pavement is constructed with 102 mm (4 inches) of
hot mix asphalt (HMA) wearing surface, 203 mm (8 inches) of
emulsion/aggregate-bituminous base, and 203 mm (8 inches) of
crushed stone subbase. The subgrade...

Question 4 4.1 A 2-lane road has a circular curve with a radius
of 210 m, curve length of 300 m. The lane width and shoulder width
are 3.6 and 1.8 m, respectively. The design speed on the road
section is 80 km/h and minimum required SSD is 115 m. Determine the
minimum acceptable distance of a building structure from the edge
of the road. (4)
4.2 An 80 km/h rural road section has a three-leg intersection.
Assume a WB50...

A section of a roadway has a horizontal curve with
superelevation of 6% and central angle of 40o. The
design speed of the section is 60 mph. There are two lanes on the
curve, each 12 ft wide. Determine:
(a) The degree of the curve.
(b) The length of the curve.
(c) The minimum distance of an obstruction from the centerline
of the innermost lane.

A horizontal curve with a 300 intersecting angle on a two-lane
highway with 12-ft has a 60 mph design speed. The radius for the
horizontal curve has been set to 1,250 ft. The PI is located at
station 85 + 29.14 and the normal crown on the tangent is 2%.
Determine:
a) Tangent to Spiral (TS) station,
b) Spiral to Curve (SC) station,
c) Curve to Spiral (CS) station, and d) Spiral to Tangent (ST)
station.

A horizontal curve with a 300 intersecting angle on a two-lane
highway with 12-ft has a 60 mph design speed. The radius for the
horizontal curve has been set to 1,250 ft. The PI is located at
station 85 + 29.14 and the normal crown on the tangent is 2%.
Determine:
a) Tangent to Spiral (TS) station,
b) Spiral to Curve (SC) station,
c) Curve to Spiral (CS) station, and d) Spiral to Tangent (ST)
station.

A developer has applied for a construction permit to build a
supermarket at the
southeast corner of an intersection that is formed by a four-lane
divided highway in the eastwest
direction with speed limit 50 mph and a two lane road in the
north-south direction. Traffic
on the two-lane road is controlled by a stop sign at the
intersection. Using the sight triangle
requirements at the intersection, determine whether permission
should be given for the
construction if the following conditions...

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