Further, the effect on surface buildings of vibrations due to traffic can be serious. Tunnels must also be treated acoustically, so that sound levels inside do no exceed the levels which can be tolerated by motorists. The outlets from these systems must be provided with suitable deflectors and in some way must remove (filter) the exhaust gases, the noxious fumes and pollutants. ![]() ![]() Noise and pollution from ventilation systems are also among the various problems which arise with tunnels (as they do with underground parking lots). In addition, building a road underground is by far the most costly solution.Īccording to a British estimate, building a road in a bored tunnel is 13 times more expensive than building it at ground level. Furthermore, when an underground road can be built, it is generally entirely new rather than a substitute for an existing surface road to be closed as soon as the underground road is opened.
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