Singh travelled in the buses last night for at least three hours in different routes and reviewed the security being provided along the routes and bus stops.
He also interacted with fellow travellers and listened to their suggestions about improving the bus services as well as security.
Singh also gave instructions to police on a few occasions.
The minister's exercise was part of government's efforts to improve the security in the national capital after the December 16 gangrape of the paramedic student in a moving bus.
