the brightly coloured pedestrian crossing was due to be installed in devon - the first in europe - as a mark of the town 's pride for its gay community .
but experts have warned that painting the road different colours could have side-effects for people with alzheimer 's .
fears it would cause hallucinations for dementia sufferers .
the brightly coloured crossing was due to be installed in totnes in devon - the first in europe - as a mark of the town 's pride for its gay community .