An additional height of 5.0m is possible on an overhead electric wire (railway/tramway) sign: https://assets.publishing.service.gov.uk/media/5817085d40f0b64c34

An additional height of 5.0m is possible on an overhead electric wire (railway/tramway) sign: https://assets.publishing.service.gov.uk/media/5817085d40f0b64c34000000/warning-sign-overhead-electric-cables.jpg https://assets.publishing.service.gov.uk/media/5817085d40f0b... https://www.alamy.com/stock-photo-a-railway-safety-sign-in-england-22933066.html https://www.alamy.com/stock-photo-a-railway-safety-sign-in-e...