It is not allowed to place obstacles that hinder the free movement of vehicles because this can cause dangerous situations and is prohibited by traffic regulations.

- **Obstruction of passage**: A parked vehicle that blocks the passage of other vehicles creates an obstacle on the road. This is dangerous and prohibited, as it can block the normal flow of traffic and cause accidents.

- **Interference with signals and maneuvers**: Parking in places where traffic signals are obstructed or where other vehicles cannot turn correctly is also an obstacle. This can lead to confusion and dangerous situations on the road.

- **Reserved and safety zones**: Parking in areas reserved for people with disabilities, in bus lanes, or on pedestrian crossings, among others, is an obstacle that affects the safety and access of other road users.

- **Traffic regulation**: Stopping or parking in places that regulate traffic, such as traffic islands, is also considered an obstacle. These places are designed to facilitate vehicle flow, and their obstruction can cause disorder and accidents.

For these reasons, placing obstacles that hinder circulation is prohibited to ensure safety and order on the roads.