Under Article 158 of Bahrain's Traffic Law Implementing Regulation, what is the standard maximum width of a private-transport goods vehicle, trailer or semi-trailer?

1. 2.20 metres, with no exceptions
2. 2.60 metres, with the Directorate empowered to allow up to 3 metres for trailers and semi-trailers and up to 3.5 metres for heavy-machinery carriers
3. 3.50 metres for every commercial vehicle
4. Width is limited only by the width of the traffic lane