See the following case from www.safetynews.co.uk.
England
Mobile tower platform plunge
In June 2007, an employee of West Sussex company RH Phillips & Sons Ltd fell from the top platform of an unguarded mobile tower scaffold, fracturing his ribs.
Investigation found the persons who set up the scaffolding tower were not suitably competent to erect or dismantle the equipment, the scaffolding itself was unfit for use in a work activity, and that the injured worker had received no training or instruction from his employer on its use.
The company was fined £2,500 and ordered to pay £1,600 costs having breached the Work at Height Regulations 2005. 21st April 2008.
Mobile tower scaffold is a common equipment or structure used in workplaces, in particular construction worksites. One of the most common unsafe acts while using mobile tower scaffold is riding of the scaffold while it is being moved. If the scaffold bums into debris or obstacles on the ground there is a relatively high probability that the worker riding the scaffold will fall off the scaffold. This is especially so if the mobile tower scaffold is not erected by competent persons. See this HSE guide for some guidance on mobile scaffold.