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# Design of Road Curves for Safety - Essay Example

## Extract of sampleDesign of Road Curves for Safety

One of the earlier studies in the effect of curves on the safety of the roads in along London to Birmingham was reported by Hauer (2001). The data obtained in the field studies analysed are presented in the Table 1
Injury, Accidents
(Million Vehicles Miles)
- 1.8
0.8

-1.2
0.4

10.4
0.6

0.4
0.25

1.2
0.35

1.8
0.3
-1.2
0.3

-0.4
1.05

1.8
0.85

1.1
0.4

0.5
0.5
-1.8
0.6

0.4
0.35

1.1
0.4

1.8
0.45

Table 1
Effect of curves on road safety
The results also showed that the effect of vertical curves on the road safety was not very significant. The most striking feature was the combination of grades with the horizontal alignment. Higher the grades as well as higher degree of curves resulted in the increased rate of accidents. Also, the combination of grades with alignment too resulted in the cumulative effect on the accident occurrence. In an another initiative , the detailed road safety audit exercise conducted in UK brought out the different aspects of the road that often lead to accidents (Motoring Policy, n.d.). According to vehicle user, the major reasons for the accidents at the curves are due to higher actual speed of vehicles than the design speed, obstruction to sign boards due to overgrown vegetation and absence of safety fences.
Prevailing Guidelines for design of curves
In UK, the guidelines are as per the UK departmental Standard TD 9/93 "High Way Link Design". But often less attention is paid in strictly adhering to the norms and specifications. And the road curves are built to alternate framework. This ultimately lead to non-uniform road networks and driver confusion due to poor visibility etc (Department of Transport, 1987). The safe guidelines for the design of curves are given as follows. Design speed is the one of the most important parameter that links different factors that ensures safe driving conditions. The design speed is given as Vdesign = 127.R.(e + f ), where Vdesign is in Km /hr, R is the radius in meters, e is the super elevation in metres per metre and f is the side friction factor (Transport Research Laboratory, 1988). The ...Show more

## Summary

A road is considered safe if it has a very less histories of accidents or collisions. But all roads would have had at least a few cases of minor collisions . Among the different road components, the curves are the major points of concern along the road system (Glennon, 2003)…
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