1. Warning signs are usually __ -shaped. A. circle B. triangle C. diamond 2. Pedestrians, cyclists horse drawn vehicles and wheel chair users are known as __ A. vulnerable road users. B. illegal road users C. nuisance road users.

1. B. triangle<br />2. A. vulnerable road users.<br /><br />Explanation:<br />1. Warning signs are typically diamond-shaped, but the options provided do not include diamond. Among the given options, the closest shape to a diamond is a triangle.<br />2. Pedestrians, cyclists, horse-drawn vehicles, and wheelchair users are considered vulnerable road users because they are more exposed to potential harm in traffic situations compared to motorized vehicle occupants.