As a blizzard bore down on New York City on Sunday and Monday, 911 dispatchers fielded tens of thousands of calls, trying to triage them by level of severity, from snowed-in cars at the low end to life-threatening emergencies at the highest. But even the ambulances assigned the most serious of the calls sometimes could not get there. At least 200 ambulances got stuck on unplowed streets or were blocked in by abandoned cars, city officials said Tuesday.
