A road safety group says that a county where speed cameras have been deactivated has seen an increase in the number of people speeding.
Budget cuts meant that Oxfordshire's speed cameras were switched off, but radar equipment was left in some locations.
Readings taken over five days revealed that the number of drivers speeding soared by up to 88% - a rise which the Thames Valley's Safer Road Partnership described as potentially "very worrying".
And if driving speeds continue to soar, thencar insurance prices may also rise with an increase in the number of accidents on the roads.
Although there is no longer a camera to record details, the radar units were set to record speeds of over 35mph in 30mph zones.
The partnership recorded data from two sites, with one on Oxford's Watlington Road detecting 62 offences - a rise of 88% compared to the 33 offences they anticipated over five days.
A speed camera on the A44 in Woodstock detected 110 offences, where 93 offences would have been expected when compared with past data - a rise of 18.3%.
Dan Campsall, of the partnership, said: "These are very limited results from just two locations and a few days worth of data. However, if this is a trend that grows across Oxfordshire it is very worrying indeed."
Inspector Paul Winks, from Thames Valley Police, told BBC Online: "It clearly means switching off the camera has given a green light to a small number of people to break the law."
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