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.
minimum clear width of a stairway at or below the handrail, when one is required, is 31 Â½ inches, and 27. inches where two are required. Stair trim, stringers and other features may reduce the stairway width as. long as they do not extend beyond the allowable handrail projection. There is a width exception for. spiral stairways. The maximum riser height is 8 Â¼ inches and the minimum tread depth is 9 inches. Open risers are permitted provided the vertical opening between treads does not permit the passage of a. 4-inch-diameter sphere in stairways which have a rise exceeding 30 inches.