No, but due to increased booze consumption over the festive period, it does increase the likelihood of some people becoming significantly less aware of said hazards.
Drunk people are a hazard, and there are more drunk at christmas, so yes, christmas time does change (increase) the hazards. There's more suicides too at that time.
There's also the fact that winter is upon us - unexpected ice means people can slip, the cold and dark weather means people aren't as happy to wait for 5 minutes for the barriers to be down and are more likely to take chances.
January has more people sober than normal (it's a popular 'detox' month, and people are broke having overspent at christmas), and people are more used to the weather. By the time February rolls round the nights are getting shorter - days are 2 hours longer than in December