Abstract
This study concerns road traffic noise in Greater Cairo, the capital
and the largest city in Egypt and the eleventh biggest city in the
world. Extensive measurements were carried out in 21 sites in Greater
Cairo. Restrictions were introduced to improve environmental conditions
including: (i) a ban on horns, (ii) a ban on horns and trucks, (iii)
a ban on horns, trucks and noisy buses. Equivalent noise levels (LAeq)
were measured before and after these restrictions. The equivalent
noise level was considerably reduced by the bans. This shows that
the town planner can use various strategies to change the traffic
composition in order to achieve quieter city environments. The degree
of annoyance was measured by means of questionnaire. The results
showed that there was a strong relationship between road traffic
noise levels and the percentage of highly annoyed respondents.
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