The GNL Podcast

Episode 16 — Diabetes and Driving: Why You Need to Be 5 to Drive

Prof. Pratik Choudhary, Chair of the DVLA Medical Advisory Panel on Diabetes, joins John Pemberton to break down the rules, risks, and realities of driving with type 1 diabetes.

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About the Guest

Guest: Professor Pratik Choudhary (Leicester Diabetes Centre; Chair, DVLA Medical Advisory Panel on Diabetes).
Host: John Pemberton, The Glucose Never Lies.

Driving with type 1 diabetes is not just a question of safety — it comes with clear legal responsibilities. This episode unpacks what those responsibilities are and how to meet them in practice.

What the Episode Covers

  • The legal differences between Group 1 (cars, motorcycles up to 3.5 t, up to 8 passengers) and Group 2 (HGV, minibuses, passenger vehicles over 3.5 t or over 8 passengers) licences.
  • Why the law requires a glucose reading of at least 5 mmol/L before driving — the “5 to drive” rule.
  • The 45-minute rule: after treating a hypoglycaemic episode, DVLA rules require waiting 45 minutes once you are back above 5 mmol/L before driving.
  • When CGM readings are accepted (Group 1) versus when finger-prick testing is currently mandatory (Group 2).
  • The importance of self-declaring severe hypoglycaemia: two daytime events in 12 months means the legal requirement is to report to the DVLA.
  • Practical steps: keeping your meter’s date and time accurate, carrying a backup meter, and setting CGM low alerts at 5 mmol/L for long journeys.

Key Rules Summary

  • 5 to drive: glucose must be at or above 5.0 mmol/L
  • 4.0–4.9 mmol/L: have a snack, then check again before driving
  • Below 4.0 mmol/L: treat the hypo, confirm you are back above 5.0 mmol/L, then wait 45 minutes
  • Check at least every 2 hours on a long journey — each check has a time limit like a parking ticket
  • Group 1 drivers: CGM or finger-prick are both accepted under current rules
  • Group 2 drivers: finger-prick only under current rules (pending any law change)
  • Severe hypoglycaemia: two daytime events in 12 months means the legal requirement is to self-declare to the DVLA
  • Responsibility lies with the driver — not the clinician

This content is for educational exploration only. It describes average responses and general principles. It is not medical advice and cannot replace individual clinical guidance from your diabetes care team. For the legally binding rules, always consult the official DVLA guidance INF294. Rules may change.

Visual Summaries

Summary of Group 1 driving rules for people with type 1 diabetes — including the 5 to drive threshold and 45-minute rule

Group 1 Rules Summary

Summary of Group 2 driving rules for people with type 1 diabetes — including mandatory finger-prick testing requirement

Group 2 Rules Summary

Resources and Further Reading

This article is a summary of Episode 16 of The Glucose Never Lies Podcast (recorded 4 September 2025). It does not replace official DVLA guidance (INF294). Rules may change — always check the latest DVLA information before making decisions about driving. Prepared by John Pemberton and Professor Pratik Choudhary.