There are two cycle routes that I have used regularly in the city. When I lived on the southside, I would take one through Rathmines, over Portobello Bridge, that was about as wide as a sparrow's wing span. It was a task in itself not to be culled by potholes or vans turning left onto the canal before dicing with death across three lanes of traffic to get into the correct spot for turning down Harcourt Street. At one point I considered attaching sparklers to my signalling arm to make my intentions that bit clearer.
My more recent cycle path -- or psycho-path as it would be more appropriately named -- has made me hang up my helmet for good.