I could start.
Certainly we're monitoring the volume of traffic we're moving across every grade crossing. If the amount of traffic we're handling significantly increases, we automatically do a risk assessment and that will likely involve our going to the community and asking for road traffic volumes. Then we'll do the cross-product and that will determine whether something needs to be done on that particular crossing. Every time there's a significant change in the business, whether it be the volume or the commodities we handle, that triggers a risk assessment and the risk assessment will look at the crossings that are impacted.