How to compare traffic on two roads fairly

Start with question, not ranking

“Which road is busier?” sounds simple. It may mean total daily vehicles, peak-hour queues, HGV activity, change over time or traffic directly outside one property. AADF answers total average daily flow at a point. Define intended comparison before choosing figures.

Step 1: verify locations

Open each result and inspect map position plus junction description. Long roads can contain multiple count points with very different flows. Town-centre segment, bypass and rural approach should not be collapsed into one road-wide fact unless purpose truly needs summary.

Step 2: align years

Compare same year whenever possible. Traffic can change after new development, pandemic disruption, bypass opening or network alteration. Comparing Road A in 2025 with Road B in 2017 mixes road difference with time difference. If years cannot align, state both prominently.

Step 3: check evidence method

Fresh Counted value and older Estimated value carry different site-specific confidence. Read detailed estimation method and most recent actual count. Large apparent gap may still support broad conclusion; small gap may be meaningless given method uncertainty.

Step 4: compare like with like

Motorway, A road and sampled local street serve different roles. This site’s colour bands compare each location with same broad DfT road type—Major or Minor. Colour helps context but is not universal threshold. “Very busy local road” can carry fewer vehicles than “quiet main road.” Use raw values alongside relative label.

Step 5: inspect vehicle mix

Two roads with 10,000 motor vehicles per day may feel different if one carries more HGVs, buses or motorcycles. Vehicle mix can matter for noise, vibration, emissions perception and street function. Pedal cycles are reported separately and should not be added to motor-vehicle headline without clear labelling.

Step 6: read history

One-year change can reflect method changes or unusual period. Five-year and full-record views reveal whether difference is persistent. Watch discontinuities where count-point definition or network layout may have changed. Trend is strongest when location remains comparable and methods are understood.

Step 7: write conclusion with limits

Good conclusion: “At selected 2025 count points, Road A’s estimated average daily motor flow was about 35% higher than Road B’s; both were estimated, and figures do not show peak-hour congestion.” Weak conclusion: “Road A always has 35% more traffic.” First statement preserves place, year, method and scope.

Quick comparison checklist

• Same question
• Correct pins
• Same year
• Comparable methods
• Road types understood
• Vehicle mix checked
• Limitations stated