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Why can't we strengthen the Forth road bridge?

The article on the new Forth crossing begs a number of questions before some £4bn is spent on a new bridge.

We are being challenged about sustainability and yet the current suspension bridge may close at roughly half of the national aim for a life of 120 years. Towers such as Severn have been strengthened in the past and lanes added such as the "Nippon Clip-ons" in New Zealand.

The existing towers could be extended laterally with further towers to carry further cables to support further roadways for various types of transport. The new cables could hold up the centre roadway while the existing cables were replaced.

JOHN JUBB, Tanglewood, Barton-on-Sea, BH25 5PW

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