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There are 20 bridges across the river Thames in London which can carry road traffic plus as many more bridges which are only for rail traffic or pedestrians.
There are over 200 bridges and tunnels to cross the river Thames. Tower Bridge, London Bridge and Westminster Bridge are probably the best known.
You can walk, cycle, use a bus or drive. Ferry boat.
Incomplete question - does not say which river
The river Thames has many bridges crossing it - 25 in London alone.
There are many river in Wales and it might be a matter of opinion which were the 'main' ones. However two rivers which begin in Wales and flow into England are, or were, of major importance. These are the River Severn in Mid/South Wales and the River Dee in North Wales. For more information about Welsh rivers see the related link below.
There are 44 bridges that are now in use on the Hudson River. About 10 of these bridges are used for railroad crossings and 34 are automobile bridges. There are also 5 tunnels that traverse roadways under the Hudson River.
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