Explanation:
Two types of bus lane

Two types of lane are provided for buses. They are bus only lanes, or bus lanes:
Bus only lane

Bus only lanes are for the exclusive use of buses.

Bus only lanes are sign-posted or marked as bus only lanes. No other vehicles are permitted to travel or stop in a bus-only lane. The only exceptions are authorised special purpose vehicles. A continuous white line generally separates a bus only lane from a general traffic lane.

Intersections incorporating a bus only lane generally display a "B" on the traffic signals to give buses priority over general traffic.
Bus lane

Bus lanes are sign-posted or marked as bus lanes. They are provided primarily for buses, but can also be used by:

Taxis.
Hire cars (but not rental cars).
Motorcycles and bicycles.
Emergency vehicles.
Special purpose vehicles and vehicles also operated by or under the direction of Roads and Maritime Services.

General traffic is also permitted to travel in a bus lane for up to 100 metres to:

Turn left or right into or out of a street.
Enter or leave a property adjacent to the bus lane.
Pass another vehicle that has stopped to turn right or to avoid an obstruction.

http://www.rms.nsw.gov.au/roads/using-roads/buses/bus-lanes....


A bus lane or bus-only lane is a lane restricted to buses, often on certain days and times, and generally used to speed up public transport that would be otherwise held up by traffic congestion. Bus lanes are a key component of a high-quality bus rapid transit (BRT) network, improving bus travel speeds and reliability by reducing delay caused by other traffic.

https://en.wikipedia.org/wiki/Bus_lane


Aspen bus lane construction begins

ASPEN ” With one road construction project about to be completed, another one is beginning at the Entrance to Aspen.

Monday marks the official beginning of the construction of exclusive bus lanes between Buttermilk and the roundabout, which is expected to take six months.

Construction along the 1.2-mile stretch on the outskirts of town is expected to be finished by October, said Rick Everist, spokesman for Castle Rock Construction, the Denver-based firm handling the project.

The Maroon Creek Bridge, which has been under construction for the past three years, is set to be complete by June 4. But because of the construction, the new bridge won’t be opened until later in the month and will be used for diverting traffic from the upvalley lanes.

http://www.aspentimes.com/news/aspen-bus-lane-construction-b...