abs,traction control, handbrake warning all on !

i was driving to work on the motorway in my fabia 1.9tdipd when the abs light ,the small warning triangle light and the handbrake waring light all came on and started bleeping. i pulled into the services turned off the ignition left it a few min's then turned it back on and they wernt there. i drove the 10 miles further to work and no more warning light's , what do you think happened ??????h :S (they have never came on before or since)