T3
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| T3 | ||||
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| From: | Dublin (O147342) | |||
| To: | Sligo (G687359) | |||
| Via: | Mullingar, Longford | |||
| Now part of: | N4, R148 | |||
| Route outline (key) | ||||
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The T3 was the original number allocated to the Dublin - Sligo trunk route. In 1977, following reorganisation of road numbers in the Republic of Ireland, it became the N4. Since then, it has been bypassed by sections of M4.