According to various aspects, a vehicle may include: an external structure; an assembly configured to allow a movement of at least a part of the assembly relative to the external structure at least from a first position to a second position, wherein the assembly protrudes from the external structure with a first distance in the first position and with a second distance less than the first distance in the second position; one or more sensors configured to receive obstacle information associated with one or more obstacles in a vicinity of the vehicle; one or more processors configured to determine a collision threat to the assembly based on the obstacle information, and trigger the movement of at least the part of the assembly from the first position into the second position in the case that the collision threat is determined.

A signal system for a vehicle has a vehicle mount that is configured to be attached to the vehicle. A power source is arranged through the vehicle mount and electrically coupled to a vehicle power source. A solenoid is electrically coupled to the power source and mechanically coupled to a spring. An arrow main pole is mechanically coupled to the spring, a first head blade and a second head blade. A solenoid controller is electrically coupled to the solenoid. Activating the solenoid controller engages the spring to rotate the arrow main pole approximately 180 degrees in a first direction into an expanded arrangement. Collapsing of this expanded arrangement by hand reloads the rotational energy back into the springs that can produce a future expanded arrangement.

According to various aspects, a vehicle may include: an external structure; an assembly configured to allow a movement of at least a part of the assembly relative to the external structure at least from a first position to a second position, wherein the assembly protrudes from the external structure with a first distance in the first position and with a second distance less than the first distance in the second position; one or more sensors configured to receive obstacle information associated with one or more obstacles in a vicinity of the vehicle; one or more processors configured to determine a collision threat to the assembly based on the obstacle information, and trigger the movement of at least the part of the assembly from the first position into the second position in the case that the collision threat is determined.