Sharing the Road
Large trucks and buses
Tractor-trailers and buses have large blind spots, called no-zones, on both sides, directly behind, and in front. If you cannot see the driver's face in the mirror, the driver cannot see you. Trucks need far more distance to stop than cars, and they swing wide before a right turn, often drifting left first. Never pass a turning truck on the right, and never squeeze between a truck and the curb.
Motorcycles, bicycles, and trains
Motorcycles are small and easy to lose in a blind spot, so give them a full lane and extra following distance. New Mexico requires riders under 18 to wear a helmet, though adults may ride without one. Bicycles are vehicles: pass only when you can leave a safe margin, and watch for riders swerving around potholes or debris. At railroad crossings, never stop on the tracks and never drive around lowered gates.
Emergency vehicles and passing
When an emergency vehicle approaches with lights and siren, pull to the right and stop until it passes. Do not follow a fire truck closely. When passing, complete the maneuver only with clear sight distance, and return to your lane only when you can see the passed vehicle in your mirror.
Worked example
A truck ahead signals right but moves left. Reasoning: the driver is setting up a wide turn and needs the extra room. Passing on the right would put you in the truck's no-zone and the path of its rear wheels, which track tighter than the front. Hang back and let the truck complete the turn.
Traps that cost marks
Assuming a truck can stop as quickly as a car; passing a turning truck on the right; riding in a blind spot; driving around a lowered railroad gate; following an emergency vehicle through an intersection.