Reading delivery windows against arrival stamps
A practical way to compare promised morning slots with what your logistics tracking app actually records at the door.
Customer service often publishes a single morning window across mixed postcodes. The tracking app, meanwhile, stamps arrivals that cluster late for certain industrial estates while residential drops still land early. Without separating those groups, the average looks “almost fine” and nobody adjusts the promise.
Pull a fortnight of completed deliveries. Split by estate or postcode band, not by driver. For each band, note the median arrival and the share that misses the published window by more than thirty minutes. Bands with late medians usually need an earlier dispatch cut-off or a longer published window — different fixes for the same symptom.
Keep festive weeks out of the baseline sample. Malaysian Peak Festive traffic can distort a quiet fortnight’s lesson if you blend them without labelling the period.