I just saw a Boston Globe article in which cycling advocacy groups are demanding that 18-wheel trucks be banned from the city after yet another cyclist fatality caused by a turning truck.
I think this is a great idea, but cycling safety shouldn't be the only motivation. I have always been annoyed at how wasteful and ridiculous it is to have enormous diesel semis roaring through compact city streets to cover relatively short distances with small amounts of cargo. Starbucks uses 53’ trailers to deliver coffee and cups to their stores, for example. Really, you couldn't do that with a lightweight van?
I'm sure that with all the construction in town, an absolute ban is not feasible, but there's no reason we couldn't head the direction of more progressive cities like Oslo and Paris by requiring that delivery vehicles get smaller, lighter, and more electric.