[bmsleight_]

"cross pedestrian inhibit"

As the are in affect two different crossing, with a stagger between them. The guidance is to avoid a pedestrian having to wait a whole cycle in the middle or tempted to rush both parts. One cycle wait, breaks down a bit for heavy used crossing. But the cycle time should be lower, if ped flow are up.

In an ideal situation, you could set the order of each part to be tidal - if near for example a station exit.