FAQs

Benefits – 

• Larger wheelbase emergency vehicles (e.g., ambulances and fire appliances) can travel more quickly with less discomfort than sinusoidal humps; and,
• Lower noise and vibration would be felt by adjacent residents and businesses, when compared to sinusoidal humps.

 Dis-benefits – 

• Less effective in reducing traffic speeds than sinusoidal humps; 
• Speed cushions that fall along bus routes (e.g., Mollison Way) would have to be made narrower in order to comply with design guidance, therefore reducing impact on speeding vehicles even further; 
• Speed cushions are not preferred by cyclists because they constrain the ability of cyclists to choose their preferred position in the carriageway; and,
• Larger wheelbase non-emergency vehicles (e.g., SUVs, commercial vans, and HGVs) are still able to travel over the speed cushions relatively unhindered.

Benefits – 

• More effective in reducing traffic speeds than speed cushions, as motorists are unable to straddle them; 
• Sinusoidal humps are more effective in slowing down larger wheelbase non-emergency vehicles (e.g., SUVs, commercial vans, and HGVs) compared to speed cushions; and,
• Sinusoidal humps are preferred by cyclists due to increased comfort.

Dis-benefits – 

• Larger wheelbase emergency vehicles (e.g., ambulances, fire appliances) response times will be slowed down further with more discomfort felt than speed cushions; and,
• Higher noise and vibration would be felt by adjacent residents and businesses, when compared to speed cushions.