It appears there is some mild disagreement about the wisdom of bicycling in a 5 inch snow storm. The comments from some indicate that more than one bicyclist fell without a helmet:
Bicycling is a great sport and an excellent way to commute. Bicycling in winter has its merits. No one needs to remind me of cars that encroach on a bicyclist's space. I have been almost run over more than once and I am a good defensive rider. Going out in Tuesday's storm was stupid.
Also riding without a helmet is stupid.
Also riding two abreast with on-coming bicycles in narrow areas such as the Causeway bridge is stupid.