Question

A single-lane racetrack is being constructed with a 150 mph design speed. A curve on this track has a radius of 4500 ft, central angle of 30 degrees, and a PI located at station 150+40. If the coefficient of side friction is 0.3, what superelevation is required for safe vehicle travel at the design speed? Also, determine the length of the curve and station of the PC and PT.

Answer #1

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?

A developer is having a single-lane raceway constructed with a
180 km/h design speed. A curve on the raceway has a radius of 320
m, a central angle (D) of 30 degrees, and PI stationing at
11+511.200. If the design coefficient of side friction is 0.20,
determine the superelevation required at the design speed? Make
sure you use the exact equation for R and not the approximate
equation for R. Include a discussion (a short paragraph) of why
this important....

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 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 highway curve for a rural two-lane road connects front and
back tangents at Station 74+30 at an angle (delta) of 38 degrees
16’ 31”. using the maximum allowable superelevation for the
curve,(a) what would be its minimum radius for design for a posted
speed of 55mph? (b) What would be the station locations of the PC
and PT for this curve? (c) If the inner radius was kept clear of
all visual obstructions out to a distance of 45...

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 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 two-lane highway with a design speed of 106.7 km/h
requires a transition curve for a horizontal curve of 550 m radius.
The curve is used to connect the tangents that form an external
angle of 24 degree. The lanes of the highway are 3.65 m wide and
the coefficient of side friction for this design speed is 0.11. The
change of grade between the centreline and the edge (i.e. Δg) is
limited to 1 over 250 for comfort.
Calculate...

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