I have been out to a few jobs recently where customers have mentioned that their vehicles are pulling to either the left or the right.
On these circumstances the faults have been incorrect tyre pressures. I must stress that at this time of year you should be checking your pressures regularly, i would recommend at least once a week really. When checking your tyre pressures i would also suggest that you visually look over the tyre, make sure you have plenty of tread and that there are no visable cracks forming on the outside wall of the tyre. With the cold weather moving in it is vital that your tyres are up for the job.
Stay safe
Stu.