Parking on the sidewalk is a dangerous behavior for pedestrians for several reasons:

- **It obstructs the safe passage of pedestrians**: When a vehicle is parked on the sidewalk, pedestrians are forced to walk on the road, which increases the risk of being run over. This is especially dangerous in areas where drivers cannot see pedestrians well due to obstacles.

- **It increases the risk of accidents**: Pedestrians, having to step onto the roadway to avoid a vehicle parked on the sidewalk, are exposed to vehicular traffic, which can result in serious accidents, especially if vehicles are traveling at high speeds.

- **Traffic safety regulations**: Drivers have the obligation not to park on the sidewalk to protect pedestrians and allow them safe passage. Respecting these regulations is part of responsible and defensive driving, which seeks to anticipate and avoid risky situations for all road users.

For these reasons, parking on the sidewalk is a behavior that endangers pedestrians and should be avoided to ensure their safety.