Lambton OPP will be out in full force on area highways this long weekend, keeping an eye out for "the big four".
Constable Chris Doupe says distracted driving, speeding, impaired driving and failure to wear a seat belt are major factors in collisions and deaths.
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Constable Doupe says the "big four" were contributing factors in 170 of 227 road deaths investigated by the OPP this year.