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WTD and reference periods, in plain English

7 min readby HGV Time Pilot team

If you have ever stared at two different apps and wondered why one says you are fine and the other says you need a break, you have probably bumped into the Working Time Directive (WTD) — or, in the UK, the Working Time Regulations 1998 as they apply to road transport.

EU 561/2006 governs driving and rest. WTD governs working time more broadly — including other work, POA, and how your hours average out over a long reference period. They overlap, but they are not the same rulebook.

This post is a plain-English walk-through of what professional HGV drivers actually need to remember, how WTD differs from EU 561, and where HGV Time Pilot Pro fits. It is not legal advice. For the authoritative position, see GOV.UK guidance on drivers' hours and your operator's transport manager.

Two rulebooks, one shift

EU 561 / UK drivers' hoursWTD (road transport)
Main focusDriving time, breaks while driving, daily and weekly restTotal working time, break tiers across the shift, long-run averages
POADoes not reset the 4½-hour driving clockCounts as working time
Typical daily question"Can I drive another hour?""Have I had enough break across the whole shift?"
Long-run question56h week / 90h fortnight drivingAverage working time over a reference period

You can be legally fine on driving hours and still be tight on WTD — or the other way around. That is why HGV Time Pilot treats them as separate engines: the shift timer nudges you on both during a live shift; the web dashboard reconstructs WTD from your card on Pro.

Daily WTD break tiers

On a shift where your total working time (driving + other work + POA — not rest) exceeds certain thresholds, you need qualifying breaks:

Working time in the shiftBreak required
More than 6 hoursAt least 30 minutes
More than 9 hoursAt least 45 minutes

A qualifying break segment is typically a period of Break or POA of at least 15 minutes. Shorter gaps do not count toward the tier totals.

This is separate from the EU 561 rule that says you cannot drive for more than 4½ hours without a 45-minute break (or 15 + 30 split). You might take your driving break at the services and still owe WTD break time later in the shift if other work or POA pushes your working total over 6 or 9 hours.

The Android shift timer warns you before these WTD tiers are breached. Those alerts are hints for the current shift only — they are not stored as infringements. Your tachograph and driver card remain the legal record.

The reference period — why "this week" is not the whole story

WTD also looks at your working time averaged over a rolling reference period:

  • 17 weeks — the default for many UK road-transport operations
  • 26 weeks — where agreed or applicable in your operation

The idea is simple: even if no single week looks outrageous, your average weekly working time must stay within the statutory ceiling (normally 48 hours per week on average, unless you have opted out under the correct UK rules).

Night work adds another layer: WTD sets limits on night working time (work done during defined night hours). The exact classification depends on when your activities fall — another reason card-backed analysis beats guesswork.

Most drivers do not carry a 17-week spreadsheet in the cab. That is what the WTD dashboard on Pro is for.

Night work — the short version

Night work under WTD is work performed during night hours (typically between midnight and 4 a.m. for road transport, with some operational nuance). Limits apply to how much night work you can do in a reference period.

If you regularly run overnight trunks or continental legs with early-morning drops, night-work tracking matters. If you are days-only trunking, it may rarely bite — but it is worth knowing the dashboard exists when your pattern changes.

Where HGV Time Pilot fits

Live shift — Android timer (Free)

During an active shift, the timer tracks Driving, Other Work, POA, and Break/Rest and fires heads-up before:

  • EU 561 4½-hour driving limits
  • WTD 6h / 9h break tiers
  • An operational 14h / 15h shift-length guardrail (not a substitute for daily or weekly rest)

POA is treated correctly for each rulebook: it does not reset the driving clock under EU 561, but it does count toward WTD working time and can contribute to WTD break totals when the segment is long enough.

Card-backed WTD — web dashboard (Pro)

After a driver-card download, Pro unlocks the WTD dashboard on v3.hgvtimepilot.com:

  • Reference period overview — 17- or 26-week window (selectable to match your operation)
  • Weekly averages — see how your working time trends against the limit
  • Night-work coverage — night hours tracked alongside tachograph activity
  • Context next to EU 561 data — same card import, same account, two lenses on compliance

The WTD dashboard interprets tachograph card data for planning and self-checking. It is indicative — useful for spotting drift before a reference period closes, not a certificate for an enforcement officer. When the card and your memory disagree, trust the card.

Free accounts see WTD-related hints on the live timer but not the full reference-period dashboard. Upgrade to Pro, or unlock 14 days of Pro on your first card import, to explore it properly.

WTD vs "Can I drive now?" vs Daily Compliance Review

Driver statusWTD dashboardDaily Compliance Review
QuestionCan I drive right now?How am I averaging over the reference period?What happened on this day?
Rule focusEU 561 driving limits (primary)WTD averages and night workPer-day warnings and infringements
Free tierHeadline + remaining timesNo14-day teaser
Pro tierFull detailFull reference periodFull calendar + tabs

They share the same card pipeline. Download your card on Android and all three update.

Common pitfalls

  • Assuming one green light covers everything. EU 561 "OK to drive" does not automatically mean your WTD reference period is comfortable.
  • Ignoring POA for WTD. Waiting on a bay counts. A long POA block can help your WTD break totals but will not save your 4½-hour driving clock.
  • Only watching this week. Reference-period averaging punishes slow drift — a string of "busy but legal" weeks can still push your average up.
  • Confusing timer hints with infringements. WTD tier alerts on the shift timer are coaching aids. Formal flags live in Daily Compliance Review when the engine detects issues on imported card data.

A practical WTD routine

  1. Run the timer on every shift — let it coach you on WTD tiers in real time.
  2. Download your card weekly (or after any tight week).
  3. Open the WTD dashboard on the web — check your reference-period average and night-work position.
  4. If a day looks wrong, drop into Daily Compliance Review for the activity timeline.
  5. Need a file for your operator? Generate a reference period PDF from the Reports hub.

Frequently asked questions

Is WTD the same as EU 561?
No. They run in parallel. EU 561 is about driving and rest; WTD is about working time and long-run averages. HGV Time Pilot tracks both.

Do I need Pro for WTD break alerts on shift?
No. The live timer's WTD tier warnings are Free. The reference-period dashboard is Pro.

17 weeks or 26 — which should I pick?
Match what your operator uses. If you are unsure, 17 weeks is the common UK road-transport default — confirm with your transport manager.

Does the WTD dashboard change my tachograph?
No. Read-only analysis of imported card data.

Can I export WTD data?
Yes — Pro users can download a reference period report from the Reports hub alongside weekly and fortnight packs.

Keep both rulebooks in view

  1. Read EU 561/2006 in plain English for driving and rest limits.
  2. Download your card if you have not already — 14 days of Pro may unlock automatically.
  3. Sign in at v3.hgvtimepilot.com and open the WTD section on the dashboard.

Questions or corrections from the road? support@hgvtimepilot.com.


This article describes general working time concepts for professional drivers. It is not legal advice. Always follow your operator's policies and current regulations.

Try the live timer in your cab

HGV Time Pilot pairs an Android shift timer with a full compliance dashboard on the web — same account everywhere.