Hmm...... how safe, as safe as tp can be. Don't think they have a high accident rate. Maybe its because when they appear, road users behave. This ghost festival month i was involved in one accident and nearly got knock down in another. What i learned is that have a gd assessment of the traffic infront and rear before you lane change. Don't check mirror or blindspot for too long, killer..... (a couple of my friends and me met accident because of this). Its best not to overtake, follow behind heavy vehicles(their signal lights and brake lights sometimes have spoilt), taxi(we live to ride, they drive to live) and safety following distance. I have to disagree on taking the left most lane as its where theres most movement of vehicle in and out of the main road. Weather and bike maintenance plays their part. Well, talk so much also no use where a cockster come and bang you.