Clearway

The term clearway is used in several Commonwealth countries to refer to stretches of road or street where parking is prohibited.

Australia
Example of a Clearway sign in New South Wales

In Australia, a clearway is a special road upon which only taxis and buses may stop at the kerb on certain times of the day. Any other vehicle which stands at the kerb may be towed away (unless there is some form of emergency).

Clearways are used on congested roads where there is no room for additional traffic lanes. Clearways aim to improve traffic flow at certain times of the day by prohibiting stopping in the lane next to the kerb, adding another lane to the roadway (when used on both sides of the road, two are added).

In New South Wales clearways are indicated by a yellow broken line at the kerb and "clearway" signage (which indicates the times of the day upon which the clearway operates).

In Perth, Western Australia, clearways operate between 7:30 and 9:00 am, and from 4:15 to 6:00 pm on weekdays. Parking meters do not accept payment during these times.[1]

New Zealand

In New Zealand, a clearway is section of road on which it is illegal to stop for any reason other than a breakdown or an obstruction to the road such as stationary traffic. Clearways may operate at all times or for limited times such as peak traffic flow times. As such, they operate in a similar way to those in the United Kingdom.

Sign for a clearway in the UK. The plate under the sign indicates that the clearway restrictions do not apply beyond this point. A similar sign is used for clearways in many other countries.

Similar signs are deployed on New Zealand clearways to British clearways, with a standard blue circle edged in red and featuring a red diagonal cross. If the clearway is for limited periods only, this will be indicated by a small sign below the clearway sign. Whereas in the United Kingdom a further notice with the word "Begins" or "End" will indicate the extent of a clearway, in New Zealand this is indicated by small signs featuring red arrows, indicating the direction from the sign in which the clearway is in operation. Larger white signs with black or red text indicating the details of the clearway are also sometimes found, featuring an image of the red and blue circle (as on the regular signs) as a prominent feature.[2]

United Kingdom
An urban clearway in Oxford.
See also: Red route

In the United Kingdom, a clearway is a road or section of road on which it is illegal to stop on the main carriageway for any reason except in an emergency.[3]

Certain sections of urban road may be designated Urban Clearway, which is a little-used designation, but one which prevents vehicles being stopped during the peak hours, typically 0700-0930 and 1500-1800. Vehicles are permitted to stop only as long as necessary to pick up or set down passengers.[3] This allows the commuter traffic to flow more freely, but still allows for overnight and daytime parking when the road is not so busy.

Aviation

In aviation, clearway is a term related to the dimension of some runways and it is abbreviated with CWY. Clearway is an area beyond the paved runway, aligned with the runway centerline and under the control of the airport authorities. This area is not less than 500 ft and there are no protruding obstacles except for threshold lights provided that they aren't higher than 26 inches. There's a limit on the upslope of the clearway of 1.25%. The length of the clearway may be included in the length of the takeoff distance available.[4] For example, if a paved runway is 2,000 metres (6,600 ft) long and there are 400 metres (1,300 ft) of clearway beyond the end of the runway, the takeoff distance available is 2,400 metres (7,900 ft) long. When the runway is to be used for takeoff of a large airplane, the maximum permissible takeoff weight of the airplane can be based on the takeoff distance available, including clearway. Clearway allows large airplanes to take off at a heavier weight than would be allowed if only the length of the paved runway is taken into account.

See also

Notes
  1. "Clearways in Perth CBD". Main Roads Western Australia. 21 May 2013. Archived from the original on 3 May 2013. Retrieved 7 August 2013.
  2. "Traffic control devices manual (TCD Manual) - Part 13: Parking controls Archived 2013-11-08 at the Wayback Machine," NZ Transport Agency. December 2007. Retrieved 4 July 2013.
  3. UK Road Signs.
  4. US Federal Aviation Regulations, FAR Part 1, Definitions and abbreviations

References
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