
TDC Ultra User’s Manual
8-2
Saturation Flow Studies
The Saturation Flow Rate study in the TDC Ultra is actually a way to
measure several separate but related traffic parameters. With one study
you can measure:
• Vehicle headways for one to four lanes.
• Lost times for one to four lanes.
• Arrival types.
• Signal timing, on a phase by phase basis.
• Approach volume counts for each signal phase.
• Saturation Flow Rates.
This study is most commonly done in conjunction with a capacity analysis
or signal timing optimization of an intersection, usually using computer
software such as Transyt 7F, PASSER, or HCS. The parameters this study
measures are required by these software packages. In the past, engineers
had to guess at the values, now they can measure them directly.
Comentarios a estos manuales