COMPROMISED OVERLAP

[Peter]

Can anyone explain me the term 'COMPROMISED OVERLAP'?

I am not familiar with the actual term you use there, not something I am aware of in UK practice. We refer commonly to Restricted Overlap (where a full overlap is not always available and an alternative, shorter overlap is available but with the mitigation that the signal in rear of the one held at danger is approach released from red) or a reduced overlap (where the layout is such that a standard overlap is not possible and, in sympathy with the speed of approach and assessment of other risk factors, a shorter overlap is tolerated).

The term compromised sounds more like something where an overlap has become unavailable because of something having entered it.

Peter