WHILE I agree with Gordon Cubie's case for a new Clyde crossing (Letters, October 30) I do not agree with more expensive road building when an alternative public transport system could be built.

The five-mile (8km) M74 Glasgow extension, completed in 2011 route, cost £692m or £865 a centimetre, and has only benefited car and other road users.

As roads are paid for out of general taxation and not "road tax", as the motoring lobby would have us believe – it is Vehicle Excise Duty (VED) – I, as a cyclist and non-car user, object to having to pay for a road system that primarily benefits car users.

This is a great opportunity to build an underground metro system which can be used by all in society, starting at Paisley Gilmour Street Station and then going via Glasgow Airport to Renfrew; from where it would pass under the River Clyde from Renfrew to Yoker, from where it could continue north or west.

It could be used by all including: pedestrians, cyclists, kids, those with disabilities, car users, and even those under the influence of alcohol.

And while this line would only serve a small area – and away from the busier parts of the Glasgow area – it would be a start to building a world-class multi-line system; and combined with transport integration, would be a viable alternative to the political parties' obsession with cars and road building.

They could always build the line and then talk about "filling the missing link" to justify more metro lines, as they did with the M74 motorway.

If the Scottish Government is serious about climate change, traffic congestion, and greater social economic integration, this is an option it should consider, instead of continually writing reports, starting consultations, talking about "state-of-the-art" systems or "excellence in transport" which is the only thing it is good at.

Dougie McKerrell,

39, Flat 6, Braid Square, Glasgow.