Transportation Minister Mary Polak says tolls on the new Port Mann Bridge may not be responsible for an uptick in truck traffic on the Pattullo Bridge.

Surrey Mayor Dianne Watts says truck traffic on the Pattullo in January was up 25 per-cent over the previous year as a result of tolls on the new Port Mann, but Mary Polak says those numbers don't match the Government's, and there could be other reasons for the spike, "But also increased economic activity can also drive that, we're not seeing a decline on the Port Mann Bridge."

Polak says she's looking into it.

Dianne Watts took to her Twitter account (@MayorWatts) to respond to Polak's comments.

@MayorWatts - @CKNW @MaryPolakMLA we are comparing data frm yr to yr & have seen increases. 3 months of data is different We have counters on the Bridge.

@MayorWatts - @MaryPolakMLA we have Traffic Operations Center and Counters all over the city including Bridge. Monitored 24-7 we will share data No prob

NDP critic Harry Bains says tolls are the problem and the Liberals were warned, "The free alternative that they were using is the Pattullo Bridge is already overcapacity, it's dangerous, it's old."

Bains says the solution is building more transit using carbon tax revenue to reduce traffic on the bridges.