Idle time looks simple on a spreadsheet until you sit with a dispatcher in Rat Burana and watch the morning board fill. A truck waiting at a shipper gate is not the same as a truck sitting overnight because tomorrow’s load was never confirmed.
Start with two clocks: engine-off at depot and engine-on but not moving on a customer site. Mixing those clocks is how fleets invent phantom utilization problems—or miss real ones.
For Greater Bangkok corridors, mark named dwell points: Bang Pakong yards, Lat Krabang approaches, and your own wash bay. When idle spikes cluster at one gate, the chart points to a conversation with the shipper, not a new truck purchase.
Give dispatchers a daily idle strip for the ten highest offenders, not a wall of every vehicle. Owners need the monthly load-factor view. Same numbers, different grain.
If your trip sheets still arrive on paper, digitize two weeks before you judge the fleet. Thin data makes every idle story look like drama.