What is the maximum superelevation recommended for road surfaces in snowy or icy conditions?

The recommended maximum superelevation for road surfaces in snowy or icy conditions is 8%. Superelevation, or the banking of a roadway at a horizontal curve, is crucial for helping vehicles navigate turns effectively. However, in winter weather conditions, factors such as reduced traction and increased stopping distances due to ice and snow necessitate lower limits on superelevation.

Setting the maximum superelevation at 8% strikes a balance between maintaining vehicular dynamics and ensuring safety. Higher superelevation rates in slick conditions may lead to vehicles losing traction, increasing the likelihood of skidding and accidents. This is particularly important since the friction between tires and the roadway is significantly reduced in adverse weather. Limiting superelevation helps ensure that vehicles can maintain control while navigating curves in such conditions, promoting safer travel for all road users.