Llys y Gwynt Interchange
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| Llys y Gwynt Interchange Cyfnewidfa Llys y Gwynt | |||
| Location Map ( geo) | |||
 | |||
| Looking south on the former A5122. | |||
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| Location | |||
| Coed Hywel | |||
| County | |||
| Caernarfonshire | |||
| Highway Authority | |||
| Welsh Government | |||
| Junction Type | |||
| Roundabout Interchange | |||
| Roads Joined | |||
| A5, A55 | |||
Llys y Gwynt Interchange or Llandegai Interchange is Junction 11 of the A55.
It opened in 1983 as part of the Bangor bypass. Originally the bypass was A5 from this junction westward; the former A5 through Bangor became A5122. In about 2000, with the extension of the A55 across Anglesey, the whole bypass became A55 and the A5122 reverted to A5.
The construction of the junction involved a permanent 1.7-mile diversion of the north-south route, A5/A5122. The northern part was partly on the line of the B4409.
Routes
| Route | To | Notes |
| Betws-y-coed, Llanberis (A4244), Gwasanaethau / Services, Bethesda 2 | ||
| Caergybi / Holyhead, Caernarfon (A487), Ysbyty Gwynedd / Gwynedd Hospital | previously A5 | |
| Conwy | ||
| Bangor, Llandygai 1 | previously A5122 |