What is the point of route branding?

摘要

Further to Ken Crawley's letter (You Write, November), here is a quiz: What used to be cream but is now blue? What used to be purple but is now red? What used to be yellow but turned red and is now blue? What used to be blue, green and red but now is allover red? What used to be green but is now pink? What used to be blue but is now silver? Answers: buses operated by Go North East running on branded routes in my hometown.