Question

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.

Answer #1

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.

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?

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)?

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...

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 5° curve (measured at the centerline of the inside lane) is
being designed for a highway with a design speed of 100 km/h. The
curve is on a 2% upgrade, and driver reaction time may be taken as
2.5 seconds. What is the closest any roadside object may be placed
to the centerline of the inside lane of the roadway while
maintaining adequate stopping sight distance?

A developer has requested permission to build a large retail
store at a location adjacent to the intersection of an undivided
four-lane major road and a two-lane minor road. Traffic on the
minor road is controlled by a stop sign. The speed limits are 35
mph and 50 mph on the minor and major roads, respectively. The
building is to be located at a distance of 65 ft from the near lane
of one of the approaches of the minor...

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.

SR 360 is a four-lane highway without median with 12-ft lanes
and 70 mph design speed.In one section of the highway,a transition
must be made between a horizontal curve with radius 1828.2 ft and a
tangent section.
a)What is the minimum required length of the spiral transition
curve?
b)How long should the transition runoff length be?Assumed
rotated through the center line
c)Which one of the two values will you adopt as your transition
curve length? Why?

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.

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