Holding a Group 2 driving licence — which covers HGV (categories C and C+E) and PCV (category D) vehicles — requires meeting significantly stricter medical standards than a standard Group 1 car licence. The DVLA sets these standards because professional drivers spend far more time at the wheel, often under time pressure, and any sudden medical event could have catastrophic consequences for other road users. This guide explains every aspect of the fitness requirements, what the D4 medical examination tests, and how to maintain your fitness throughout your career.
Why HGV Drivers Face Stricter Medical Standards
The Group 2 medical standards are set by the DVLA under the guidance of the Secretary of State for Transport. They are stricter than Group 1 standards because professional drivers drive larger, heavier vehicles for longer periods. A sudden incapacitating event — a heart attack, epileptic seizure, or diabetic hypoglycaemic episode — in a 44-tonne articulated lorry poses a far greater risk than the same event in a car.
The D4 Medical Examination
The D4 medical examination is conducted by a DVLA-registered medical practitioner. It is not the same as a standard GP appointment — the doctor completes a specific DVLA form (D4) that covers a defined set of assessments. The examination typically takes 45–60 minutes and costs £50–£120 depending on the provider.
What the D4 Medical Covers
| Assessment Area | Standard Required |
|---|---|
| Vision (acuity) | At least 6/7.5 in the better eye and 6/60 in the worse eye |
| Visual field | At least 160° horizontal, 70° left and right of centre |
| Blood pressure | Must be below 180/100 mmHg at examination |
| Cardiovascular | No significant arrhythmia, heart failure, or recent cardiac events |
| Diabetes | Insulin-treated diabetes requires individual DVLA assessment |
| Epilepsy | 10-year seizure-free period required |
| Sleep apnoea | Must be effectively treated and confirmed by sleep specialist |
How Often Is the D4 Medical Required?
| Age | D4 Medical Frequency |
|---|---|
| Under 45 | On initial application only (licence valid to age 45) |
| 45–65 | Every 5 years |
| Over 65 | Annually |
Diabetes and HGV Driving
Insulin-treated diabetes was an absolute bar to Group 2 driving until 2011. Since then, insulin-treated diabetics can apply for a Group 2 licence subject to strict conditions: no severe hypoglycaemic episodes in the past 12 months, regular blood glucose monitoring, and annual review by a diabetologist.
Sleep Apnoea
Obstructive sleep apnoea causes excessive daytime sleepiness — a major risk factor for road traffic collisions. Drivers with untreated moderate-to-severe sleep apnoea must not drive Group 2 vehicles. Once effectively treated with CPAP therapy and confirmed by a sleep specialist, the Group 2 licence can be restored.
Maintaining Fitness Throughout Your Career
The most effective way to maintain your Group 2 medical fitness is to manage the conditions most likely to cause problems: cardiovascular health, weight, and sleep quality. If you develop a notifiable condition, you are legally required to inform the DVLA — failure to do so is a criminal offence and can invalidate your insurance.
