The argument that selling wine in the grocery store is an issue of traffic safety is poor argument. I have spent a considerable amount of time in grocery store parking lots throughout my lifetime, and I have never scene anyone pop the cork on a bottle of wine and hit the road. I have lived in states and in a few countries where all forms of alcohol are sold in grocery stores and gas stations and never saw anybody pop the cork and then drive away.
I believe the difficulty of pulling the cork in a car would be a deterrent to drinking while driving. The tall bottle would also be difficult to manage while driving and would definitely cause a spill. Red wine could cause havoc on most car interiors. Most people have perishable items when they leave the store and typically drive straight home to prevent spoilage. They also tend to buy groceries close to home so killing a whole bottle on the way home is unlikely. Beer seems like a much more likely option for drinking and driving. They also refrigerate beer, which makes it more appealing for the drive home.
If people in this town want the roads to be safer, they should ban cell phones. Every time I hit the road I see people running lights, swerving between lanes, and tail gaiting. I believe cell phones impair more drivers than booze in any form.
I tend to agree with srm5d. When driving in town I feel more at risk from drivers on cell phone talking or texting than I do from someone who is drinking. Why? Because there are more of them and "texters" are just as impaired as "drinkers".