Prevented damage, the bumper protruding just forward of the projecting lower lip to the windscreen, arranged to reduce reflections at a time most bus drivers had to squint through flat windows. The original "Nottingham Look" styled vehicles dating from 1964 did not have the bumper which made its appearance in 1968 and was used on all so designed vehicles into the 1980sThey didn't think that through did they? they'd probably fit a few more in if they took all the mahoosive bumpers off
