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1. Summary
There is a proposal to construct a road to connect the village of Llanharan to the M4
Motorway at a point between the villages of Llanharry and Brynsadler. The project details
are as follows:
Design life (n) – 15 years
Rate of growth of commercial vehicles (r) – 2%
Composition of Heavy Goods Vehicles – 15% of AADT
Generated traffic by the end of design period – 1,500 vpd
Table 1 Desirable speed distribution at year of opening the road
Speed Band (km/h) Number of observations
< 65
65 – 69
70 – 74
75 – 79
80 – 84
85 – 89
90 – 94
95 – 99
> 99
31
20
29
200
225
388
197
25
15
2. Part 1 – Horizontal and Vertical Alignment
Contribution: 25% of final module mark
Coursework detail
Aims
a) To be able to identify and compare route corridors and to reasonably avoid major
obstacles in a proposed route.
b) To be able to interpret the effect of varying the different traffic parameters on the
design properties of a section of highway.
c) To be able to identify and determine the parameters necessary for the design of
both horizontal and vertical alignments
d) To be able to design both horizontal and vertical alignments of a section of
highway.
5
Using the area map(s) provided, design and present drawings, showing:
1. The horizontal alignment of the road
Key milestones:
 Use speed distribution above to obtain 85th percentile speed, and hence establish
 Using map provided, establish a realistic route corridor in straight lines;
 Co-ordinates of all key points on the route corridor;
 Bearings of all straights;
 Intersection angles at IPs;
 TP-IP distances;
 Any other activity relevant to horizontal alignment design.
(You any use the MS Excel programme provided for horizontal alignment design, for all
or any of these steps. When this programme is used, you are required to show one
sample calculation for each step).
2. Vertical alignments of the road
Key milestones:
 Using contours, a plot of existing ground profile along the route;
 Approximate finished road profile in straight lines, relative to the existing ground profile;
 Determination of slopes of these straight lines;
 Design of vertical curves using the slopes;
 Indication of possible locations for: drainage structures (excluding their exact design
details); materials bore holes/trial pits; scales (horizontal and vertical), any other details
 Any other activity relevant to vertical alignment design.
(You any use the MS Excel programme provided for vertical alignment design, for all or any
of these steps. When this programme is used, you are required to show one sample
calculation for each step).