I've been asked to identify the driver
As the vehicle's registered keeper you must say who was driving when the offence was committed. If you fail to do so when required, the fine for not identifying them is double or triple the original.
What obliges you to answer
The vehicle's keeper must tell the traffic authority (Tráfico) who was driving at the time of the offence, with their driving licence number. The deadline is the one stated in the request itself.
«Facilitar a la Administración la identificación del conductor del vehículo en el momento de cometerse una infracción.»
If you do not identify them
Failing to identify the driver truthfully, when required to within the deadline, is a very serious offence.
«Incumplir el titular o el arrendatario del vehículo con el que se haya cometido la infracción la obligación de identificar verazmente al conductor responsable de dicha infracción, cuando sean debidamente requeridos para ello en el plazo establecido.»
How much that fine is
Double the original fine if the offence was minor, and triple if it was serious or very serious.
«La multa por la infracción prevista en el artículo 77. j) será el doble de la prevista para la infracción originaria que la motivó, si es infracción leve, y el triple, si es infracción grave o muy grave.»
If you identify them
If you were not stopped at the time and the car has no designated usual driver, the person you identify is liable for the offence.
«En los supuestos en que no tenga lugar la detención del vehículo y éste no tuviese designado un conductor habitual, será responsable el conductor identificado por el titular o el arrendatario a largo plazo, de acuerdo con las obligaciones impuestas en el artículo 11.»
Is something different in your case?
Tell us in your own words and we will tell you what applies to you, with the law in hand.
General information, not advice on your specific case. Text prepared with the help of artificial intelligence; every quotation is a verbatim extract from the official text and is checked against the BOE every night. Other common letters.