What alcohol level must bicycle riders not exceed when riding on roads open to general traffic?

Correct answer: 0.25 milligrams per liter of exhaled air.

An adult cyclist is subject to the general limit of 0.25 mg/l in breath or 0.5 g/l in blood and must take the test if officers ask, like the cyclist in the picture, who is being signaled to stop by an officer. If the cyclist is a minor, the limit is 0.0. The limit of 0.15 mg/l applies to novice drivers and professional transport, not to bicycle riding.

Real Decreto 1428/2003, de 21 de noviembre, por el que se aprueba el Reglamento General de Circulación · Real Decreto Legislativo 6/2015, de 30 de octubre, por el que se aprueba el texto refundido de la Ley sobre Tráfico, Circulación de Vehículos a Motor y Seguridad Vial