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A dual carriageway (BrE) or a divided highway (AmE) is a class of highway with carriageways for traffic travelling in opposite directions separated by a central reservation (BrE) or median (AmE). Roads with two or more carriageways which are designed to higher standards with controlled access are generally classed as motorways, freeways, etc., rather than dual carriageways.
A road without a central reservation is known as a single carriageway regardless of how many lanes there are. Dual carriageways have improved road traffic safety over the years and over single carriageways and typically have higher speed limits as a result. In some places, express lanes and local or collector lanes are used within a local-express-lane system to provide more capacity and to smooth out traffic flows for longer-distance travel.

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  1. abc_plumb

    Check Wiring Diagram for Nest Dual pls

    Hi Fellow Engineers I've attached a wiring diagram I've just completed, I wanted to make sure I've got it correct. Looking to install 2 Nest thermostats to a Worcester combi boiler. 1 Zone is radiators and the other is UFH, with pump on manifold Would be grateful to receive feedback. Thanks
  2. N

    Dual zone central heating query

    Hopefully a quick question: I have bought a new house and had a few issues with the CH system (they connected the valves for the two zones to the wrong thermostats which has now been fixed) but have now come across something that doesn't make sense to me. I have a downstairs cloakroom (toilet)...
    • Neil Atkins
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    • central central heating central heating system dual dual zone forum heating plumbing query zone
    • Replies: 2
    • Forum: Plumbing Zone
  3. D

    Hive installation - dual zone heating with Combi boiler and hot water cylinder

    Hi all, At our old flat, we had a combi boiler which dealt with heating and hot water without an additional tank. There was an external timer next to the boiler, and a room thermostat (manual) in the hallway. I was able to replace the latter with a receiver and wireless (not smart) thermostat...
    • DougieDJ
    • Thread
    • boiler central heating system combi combi boiler cylinder dual dual zone forum heating hive hot hot water hot water cylinder installation plumbing water zone
    • Replies: 9
    • Forum: Plumbing Zone
  4. K

    Dual Zone

    Hi, Looking for some advice please. I live in france. We have a house with an attached cottage. We have no heating in our house but the cottage has a combi boiler and central heating rads. Seeing as this cottage is rarely used in the winter it seems daft not to add some rads to the boiler for...
  5. A

    Wiring help needed TADO dual zone to one

    Hi I’ve replaced a dual zone system with one TADO system, pictures attached. The old system had two controllers with two valves which I’m replacing with one system that operates both valves simultaneously. picture of wiring attached (the TADO controller goes over the top) The thermostat...
    • Aaronbrett
    • Thread
    • dual dual zone forum help help needed needed plumbing tado wiring zone
    • Replies: 2
    • Forum: Plumbing Zone
  6. S

    Convert to dual zone heating

    I have a Potterton condensing combi boiler and am looking to convert to dual zone (upstairs and downstairs) The boiler is in the garage and pipes go up to upstairs radiators then dropped down from various rooms to lounge, dining room and kitchen. Could I fit valves to the downstairs piping and...
    • Sfroggat
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    • Replies: 7
    • Forum: Plumbing Zone
  7. 1

    Help! Nest - Dual zone - Opentherm!

    Afternoon all After getting to a point where i am almost ready for my new boiler system to be fitted. I am going for either a Viessmann or unvented but i think swaying towards the unvented due to hot water contingency if the boiler goes down (too many stories of people waiting days for parts...
    • 1animal1
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    • dual dual zone forum help nest opentherm plumbing zone
    • Replies: 61
    • Forum: Plumbing Zone
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