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3 May 2013, 06:00 | Updated: 8 May 2013, 13:02
There were almost 120 recorded cases of missiles being thrown at moving vehicles in the Thames Valley last year - with just 5 arrests made.
The figures show in 24 cases "missiles", like bricks and stones, were thrown from bridges and flyovers.
Nationally there were almost a 1,000 reported incidents in 2012, an increase from 395 in 2011 where 4 fewer forces gave figures.
Last year's figures include 212 incidents in Leicestershire and 190 in Nottinghamshire while in Cambridgeshire there were just 8 recorded.
Paul Watters from the AA in Basingstoke has told Heart incidents like this are very rare; "The chances of you as an individual driver having this happen to you are incredibly remote.
"The police are very aware this can happen from time to time. They target the hotspots. Sometimes the foot bridges have been enased in mesh."
In 2003 a lorry driver from Essex died after a concrete block was thrown from a footbridge over the M3. A 20-year-old was jailed for 6 years after admitting manslaughter.