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Be extra cautious when anything blocks your view. What could the driver of the blue car miss? 

Never pass when you are approaching the top of a hill. You don’t know what hazards may be on the other side of the hill. 

## Vision blocks 

Having your vision blocked is a hazard. Some examples of vision blocks are: 

• a bus that blocks your view of people about to cross the street 

• a curve or hill that doesn’t let you see what’s ahead 

• a large truck in the next lane 

• fog, rain or snow. 

Be very careful when you can’t see the whole driving scene. 

<img src='content_image/805122.jpg'>

<img src='content_image/805121.jpg'>

## Poor road conditions 

Poor road surfaces are a hazard because they can affect your traction and steering. Loose gravel, ice or rain can cause you to lose control unless you’re prepared. Some other poor road conditions are: 

• a paved road that suddenly changes into a gravel one 

• wet or icy patches 

• large puddles after a rainstorm. 

