What is the maximum permitted length of a dual axle bus?

Official question from the Israeli Ministry of Transport pool · Category: Rules and Regulations

There is no length restriction, but the length of its rear extension should not exceed 3.5 meters.
13 meters; and for an articulated bus – 18 meters.
15.5 meters; and for an articulated bus – 18.75 meters.
13.5 meters.