that accidents happen more frequently at tunnels is absolutely not evidence that visibility inside the tunnel is a remedy. Tunnels represent the only situation where a golf cart has to yield to a golf cart excepting the rare golf cart circle. Only if the accidents are occurring within the tunnel itself should money be spent to improving lighting within, unless the goal is simply to brighten the interior of the tunnel which may be worthy on its own merits. So CCD and PWAC please give us the data on accidents inside the tunnel not data on accidents near the tunnel.
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Men plug the dikes of their most needed beliefs with whatever mud they can find. - Clifford Geertz
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