Cyclists dismount, why?

Cyclists dismount

WHY?
This is the turn round of a short cul-de-sac.  Why was it necessary to deploy the 'Cyclists Dismount' sign.

The road surface is not to smart.

The Kent Cycling Battalion

The Kent Cycling Battalion

I knew that some members of the '1st. Kent Cyclist's Battalion' of WW1 are commemorated on a plaque, on  wall, inside Wye Church , what I hadn't realised  however was the existence of this grave near the entrance to the church and cemetery. 

There could be others, but I haven't looked at everyone of the many headstones here.  What  I do know is that there is a commemorative plaque to the Kent Cyclists Battalion on a wall in Canterbury Cathedral.

As Wye church lies conveniently on NCN 18 perhaps it could be a little pilgrimage for cyclists.