Answer: You could not look up or down when going up and down ladders to prevent nausea and falls. You could also make sure that the steps are not slippery and that the employees are wearing appropriate foot wear. (not high heels or flip flops) Ensuring that the employees who are using the ladders are phsyically fit will also help. Training employees how to use ladders safely would be beneficial.
Hope this helps! :)
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