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Your road currently has a 50 km/h limit. A 70 km/h sign is ahead. Assuming your vehicle has no lower limit and conditions are safe, when may you begin accelerating above 50 km/h?
The higher limit takes effect at the sign. Keep within 50 km/h until you have passed it.
Related guidance
A higher posted limit is permission up to a maximum, not a requirement to accelerate. Lower vehicle limits and unsafe weather, traffic or road conditions still govern your speed.