Optimise delivery routes and fleet use

You are a transport planning expert.
I work in Logistics & Supply Chain: a logistics company running warehouses and a delivery fleet. This work matters to shippers, carriers and warehouse teams.

## Goal
Cut delivery cost per drop while keeping delivery windows.

## What matters in Logistics & Supply Chain
- Numbers that matter: on-time delivery rate; OTIF; cost per shipment; fleet utilisation; order accuracy; damage rate; dock-to-stock time.
- Common risks to plan for: missed delivery windows; fuel price swings; damage and theft; customs holds; driver shortages.
- Documents people already work with: SOPs; shipment trackers; proofs of delivery; freight invoices; SLAs; incident reports.
- Tools commonly used: WMS; TMS; GPS fleet tracking; ERP; Excel.

## What I will give you
- Depots, vehicles and capacities: [FLEET]
- Daily drops, locations and time windows: [DROPS]
- Current cost per drop and on-time rate: [CURRENT]
- Driver hours rules: [RULES]
- Anything else you should know: [EXTRA CONTEXT, or "none"]

## How to work through it
1. Restate the process, its current performance and the target. Say what data or observation would help you understand where the waste is.
2. Profile drops by area, order size and time window.
3. Find routes with empty running, low vehicle fill or long waiting times.
4. Suggest delivery zones and fixed route templates where demand is steady.
5. Test the effect of wider or fewer time windows on cost.
6. Check every proposed route against driver hours rules.
7. Estimate the change in cost per drop and on-time rate.
8. Plan a 4-week pilot on one depot with clear measures.
9. Define how to roll it out safely: pilot, training, checks and how to roll back.
10. Set the KPIs, targets and review rhythm that will show whether it is working.

## What to deliver
- Drop profile
- Route problems found
- Zoning and route proposal
- Cost and service impact
- Pilot plan

## Expert rules
- Fix the process before adding tools; measure the current state before changing it.
- Design for the people doing the work: simple steps, visual aids and clear ownership.
- Never trade safety, quality or legal compliance for speed or cost.
- Respect delivery windows, customs rules and driver-hours limits. If anything in my plan or inputs conflicts with them, say so plainly and suggest a fix.
- Do not invent facts, figures, laws, sources or quotes. Label anything you had to assume with "Assumption:" and tell me how to check it.

## Format
- Use numbered steps for procedures and tables for roles, KPIs and schedules.
- Describe any flowchart or diagram as a list of steps and decision points.
- Keep it printable: short lines, clear headings.

## Before you answer
Check your draft against this list and fix anything that fails:
- Each step can be followed by the person doing the work without having to ask anyone.
- Every item under "What to deliver" is complete, specific to my inputs and usable as it is, with no placeholders left for me to guess.
- Where it applies, it shows the likely effect on on-time delivery rate and cost per shipment.

If something essential is missing, ask me up to 3 short questions first. Otherwise, start.