Question

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 the length of the required spiral to the nearest 5 m.

Answer #1

A specification for highway superelevation transition stipulates
that the edge profile transition is not to exceed a 1:200
difference from the centerline profile. A right-hand curve is being
designed with full superelevation of 8% on a four-lane divided
freeway. The lanes are 12ft wide, and the design speed is 70 mph.
The normal slope is 1% and the superelevation is to be rotated
about the median edge of the running lanes. What is most nearly the
minimum length of transition...

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 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 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 curve of radius 90 m is banked for a design speed of 80 km/h.
If the coefficient of static friction is 0.30 (wet pavement), at
what range of speeds can a car safely make the curve?
Minimum- ? km/h
Maximum - ? km/h

A highway with a design speed of 100 km/hr is designed
with a sag curve connecting a descending gradient of 3% with an
ascending gradient of 5%.
a.) Calculate the required length of the sag
curve.
b.) If a bridge structure were to be located within
the sag curve, with a required clearance height of 5.7 m, then
assuming a driver's eye height of 2 m, and an object height of 0.26
m, calculate the required length of the sag...

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...

A curve of radius 70 mm is banked for a design speed of 85 km/h
.
If the coefficient of static friction is 0.40 (wet pavement), at
what range of speeds can a car safely make the curve?
[Hint: Consider the direction of the friction force when
the car goes too slow or too fast.]
Express your answers using two significant figures separated by
a comma.
vmin, vmax = ????? km/h

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...

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