Table 2: How the time metrics relate to control class

Class Time Metrics
1 ΔTdj and ΔTfj  are very very small
2 ΔTdj is sufficiently short for Tfj  to be comfortably within ΔTwj 
3 Tdj is such that Tfj  is close to Twj (i.e. a near-miss)
4 Tdj is too late Tfj  being greater than Twj 
5 Tmj is greater than Twj , Tfj follows on soon after
6 Tmj is greater than Twj , there is an appreciable delay before Tfj 
7 Tmj is greater than Twj , there is a significant delay before Tfj 

Note: Δ means time relative to the time of the event, e.g. ΔTdj  = Tdj   - TEj