Interpretation of Usage Impact
Below are some example situations describing the impact on road usage or road users. It is indicated how the element impact and its associated sub-elements are used in specific situations.
One lane of a two-lane carriageway is closed
In this case, the element numberOfLanesRestricted (nR) has a value of 1. The element number numberOfOperationalLanes (nO) also has a value of 1, and the element originalNumberOfLanes (nL) has a value of 2. The rule that can be applied here is nL = nO + nR.
Speed restriction on one lane
In this case, the element numberOfLanesRestricted has a value of 1. The element numberOfOperationalLanes has a value of 2 (since the lane is still operational despite the restriction), and the element originalNumberOfLanes has a value of 2.
Situation where traffic can drive on the hard shoulder with a speed restriction
In the case where a two-lane carriageway allows traffic to drive on the hard shoulder with a speed restriction, the element numberOfLanesRestricted has a value of 1, the element originalNumberOfLanes has a value of 2, but the element numberOfOperationalLanes has a value of 3.