In addition to lunar white signals, grade timed sections are sometimes indicated by a sign with the letters " GT ", or simply " T ", in white.
12.
A system called " grade timing " regulates speeds, and is indicated by an additional " lunar white " light below the one or two coloured lights previously mentioned.
13.
But as a general matter, the conflict of interest works the other way around : A professor ought not accept anything of value from a student because it might bias her come grading time.
14.
He continued coasting downhill, still thinking that he was under grade timing and violated the signal, without realizing that if this was true, the signal would have shown red over white as he approached.
15.
GT ( grade timing ) is used in sections where a sharp turn requires a speed limit or where a downhill section would cause a train to accelerate to an unsafe speed if the driver were unwary.
16.
Now, when a signal is red ( or double red ) only because of grade timing, the ( top ) red light begins flashing once a train has passed the preceding signal that displayed the lunar white light.
17.
The white light means that the next signal is red ( or double red ) " only " because of grade timing, and if the train approaches at the " proper " speed, the signal will clear to a less restrictive aspect before the train gets there.
