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The measurement of speed limits on Irish roads has changed from miles per hour (mph) to kilometres per hour.
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| Road System in Ireland |
- In towns and cities the speed limit is 50km/h (31mph)
- Regional ( R ) and Local (L) roads, the speed limit is 80km/h (50mph) – white signs
- National roads, the speed limit is 100km/h (62mph) - Green signs
- Motorways, the speed limit is 120km/h (74mph) – Blue signs
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