Q3. (a) Briefly explain the main reason the used of transition curves, how the transition curve is used in road geometry design and the purpose of super-elevation in combine road curve design. (b) Two straights, Al and IB, whose bearings are DDD° Aľ Al" and DDD° IB' IB" respectively intersect at point I, are to be connected by a combined curve. The chainage of point / is CCCC m, while the design speed and radius have been fixed at 90 km/h and 550 m respectively. Adopting a rate of change of acceleration of 0.3 m/s³. As a civil engineer have been assign to do a trial analysis of the proposed design of horizontal combine curve (T1, T2, T3 and T4) and prepared road curve setting-out data (T1 to T2, T2 to T3, T3 to T4) at 20 m intervals using deflection angle and chord distance method. (c) By adopting the coordinate of intersection point / as (YYYY N, XXXX E). Calculate the coordinate of tangent point for T1, T2, T3 and T4.

Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter15: Geometric Design Of Highway Facilities
Section: Chapter Questions
Problem 13P
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(a) Briefly explain the main reason the used of transition curves, how the transition
curve is used in road geometry design and the purpose of super-elevation in
combine road curve design.
Q3.
(b) Two straights, Al and IB, whose bearings are DDD° AI' Al" and DDD° IB' IB"
respectively intersect at point I, are to be connected by a combined curve. The
chainage of point / is CCCC m, while the design speed and radius have been fixed at
90 km/h and 550 m respectively. Adopting a rate of change of acceleration of 0.3
m/s. As a civil engineer have been assign to do a trial analysis of the proposed
design of horizontal combine curve (T1, T2, T3 and T4) and prepared road curve
setting-out data (T1 to T2, T2 to T3, T3 to T4) at 20 m intervals using deflection angle
and chord distance method.
(c) By adopting the coordinate of intersection point / as (YYYY N, XXXX E). Calculate
the coordinate of tangent point for T1, T2, T3 and T4.
Transcribed Image Text:(a) Briefly explain the main reason the used of transition curves, how the transition curve is used in road geometry design and the purpose of super-elevation in combine road curve design. Q3. (b) Two straights, Al and IB, whose bearings are DDD° AI' Al" and DDD° IB' IB" respectively intersect at point I, are to be connected by a combined curve. The chainage of point / is CCCC m, while the design speed and radius have been fixed at 90 km/h and 550 m respectively. Adopting a rate of change of acceleration of 0.3 m/s. As a civil engineer have been assign to do a trial analysis of the proposed design of horizontal combine curve (T1, T2, T3 and T4) and prepared road curve setting-out data (T1 to T2, T2 to T3, T3 to T4) at 20 m intervals using deflection angle and chord distance method. (c) By adopting the coordinate of intersection point / as (YYYY N, XXXX E). Calculate the coordinate of tangent point for T1, T2, T3 and T4.
Q3
Beving B
North Eost Chingel
DDD* Al
A" DDD°
CHCH
171
10
10
191
10
10
3100 | 3600
2050
Transcribed Image Text:Q3 Beving B North Eost Chingel DDD* Al A" DDD° CHCH 171 10 10 191 10 10 3100 | 3600 2050
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