Alberta Class 7 Learner Knowledge Test · Question
What is the approximate speed at which a vehicle's ability to hydroplane significantly increases?
According to the Alberta Driver's Guide, the risk of hydroplaning increases significantly at speeds above 70 km/h because tires struggle to channel water away,
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Question: What is the approximate speed at which a vehicle's ability to hydroplane significantly increases?
Answer options:
- Above 30 km/h
- Above 50 km/h ✅ Above 70 km/h
- Above 90 km/h
Correct answer: Above 70 km/h
Explanation: According to the Alberta Driver's Guide, the risk of hydroplaning increases significantly at speeds above 70 km/h because tires struggle to channel water away, causing them to ride on a thin film of water. Lower speeds like 30 km/h and 50 km/h are generally safe enough for tires to maintain road contact, while waiting until 90 km/h to slow down is highly dangerous as severe hydroplaning is already well-established at that point. This concept highlights safe wet-weather traveling speeds, making it highly relevant to the Alberta Class 7 knowledge exam.
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