In an intermediate risk driving environment, you should maintain at least a __ second search in front of the vehicle and an effective space cushion.

12 second

Explanation:

According to my research on Driving Safety, I can say that based on the information provided within the question in an intermediate risk driving environment you should maintain at least a 12 second space between cars.

Intermediate risk driving is an environment that includes controlled intersections and normal traffic in which cars are traveling less than 55 miles per hour

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two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.