There is a trend at the regional level to no longer concentrate traffic on motorways only, but to divert some of it to the secondary road network. This trend is known as Network Management. Because the secondary road network is less safe than the main road network, this strategy will inevitably result in more road crashes and casualties if no additional measures are taken. Several methods are available to examine at the network level which measures are necessary to prevent this decline in road safety and to come to a sustainably safe traffic situation: the road network test, the Sustainably Safe Indicator, the Road Safety Audit, and calculation and comparison of crash rate data.
