Sinus Bradycardia. Sinus bradycardia is a heart rate below normal range for age. The rhythm originates in the sinus node, and ECG demonstrates a normal P-wave axis (upright in leads II and aVF) with a QRS following every P wave and a P wave preceding every QRS complex.
This means fitting the right tyres and for safety ensuring that they are inflated to the manufacturer's recommended pressure. The legal limit for minimum depth of the tread on your tyres is 1.6 millimetres, across the central  of the tread around the complete circumference of the tyre. For safety reasons it is recommended that you replace your tyres before the legal limit is reached. Many vehicle manufacturers recommend replacing at 3 millimetres. At 1.6 millimetres in wet weather it takes an extra two car lengths (8 metres) to stop at 50 mph than if your tread was 3 millimetres. A regular check of your tyres can help you to avoid 3 penalty points and 2,500 in fines for having tyres worn beyond the legal minimum limit on your vehicle.
What is the minimum tire tread depth required over three quarters of the width of an lgv tire? LGV's must have a tread depth of at least 1mm across 3/4 of the breadth of the tread and in a continuious band around the entire circumference