Atualização do abaixo-assinadoInstall special marker lights in the Severn Tunnel at the exact point below the M4 bridge!

Such an installation is definitely possible

Ro---- Ash----- (Mr Easter!)Kingston-upon-Thames, Reino Unido

26 de mar. de 2026

Such an installation is definitely possible.

Although GPS signals are lost underground, using measurements from the tunnel portal, engineers can pinpoint the exact location and won't cause problems at the tunnel is frequently closed for maintenance with mainline services on diversionary routes instead,

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