Multiple bus collision

In a busy city like London, traffic accidents are bound to happen and they are not infrequent, but accidents involving multiple buses must be quite rare. There was an accident in Westminster in which three buses collided. I was walking towards Trafalgar Square yesterday early evening, and saw one of the new double-decker buses being towed away, a couple of hours after the accident. According to www.mirror.co.uk/news/uk-news/bus-smash-injures-15-after-7158884, fifteen people were hurt, but thankfully no one was injured seriously. The bus did not look at its best, and hopefully there are lessons to be learnt and improvements to be made to the design, so that the buses become even safer for the passengers.