"We have concerns with the current road layout on either side of the bridge, " he said.
Which lane is used - offside lane, middle or nearside - will depend on the road layout.
New road layout plans for a notorious bottleneck in Gloucestershire have been dropped by the Highways Agency.
The new road layout will also form part of a new bus network.
The road layout on Marston Road and Bay Hog Lane had been described as dangerous by a consultant's report.
Now, a new road layout, increased parking and a new short-stay car park is being built to make it easier for people travelling into the town.
Work to replace road signs and markings and create a revised road layout on the London-bound carriageway, near Heathrow Airport, began at 2200 GMT on Monday.
However, Councillor Mark Howell, from Poole People Party, believes little progress has been made on the Marston Road and Bay Hog Lane road layout since November's report.
BBC: Poole harbour road layout plans still to be implemented
He said the road layout would be returned to its original configuration at the end of the trial period, and a thorough review would be carried out with all interested parties.
However, even when roads have been treated, drivers should still take care, especially on stretches where the local road layout or landscape means there could be a greater risk of ice forming.
Campaigners had been calling for a reduction in the 70 mph speed limit between Picket Post and the Ashley Heath interchange as well as improved signage and a redesign of the road layout.
Chloe and Debbie, Callum's mum, had a great chat about how the road layout was different when Debbie moved to the west Midlands in 1988, and Chloe enjoyed hearing about the history of her hometown.
Stallholders at Winchester market have changed their layout to improve road visibility following an accident when a bus hit a boy.
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