Sydney Cycleways shared bike path graphics

It's great to see the continual improvements being made to Sydney's bicycle infrastructure, but these new shared path graphics have me stumped. 'Caution: Adults and children falling through giant rollers'??? I have offered my graphic design services to Sydney Cycleways on a gratis basis...

Here's something I prepared earlier for City Bike Depot. The CBD Orange is far more spectacular when not shot with a rubbish CyberShot...