Cracking the whip against underage driving, as many 69 parents have been jailed in Hyderabad over the past one month for allowing their minor children to drive, police said. The Hyderabad Traffic Police (HTP), as part of its campaign against underage driving found minors in the age group of 14-16 years, driving bikes, scooters and cars and in some cases even three-wheelers, without driving licences, Deputy Commissioner of Police (Traffic) A V Ranganath said.