Repellor vehicle

A repellor vehicle is a vehicle (with human driver or virtual operator) that steers away from obstacles. Overall there are three main techniques of driver interaction:
# direct user interaction,
# physical controls, and/or
# virtual controls. Repellors can also be unstable fixed points.
A repellor either the driver or virtual controller must guard against is the formation of spurious attractors (or repellors).
Attractor
An attractor is an object which draws the driver or vehicle toward itself such as a planet with a simulated (or real) gravity.
As an autonomous vehicle moves, sensory information changes, thus attractors and repellors shift.
Sometimes a driver’s direction of motion is influenced by objects present in the virtual world.
Driver-assisted systems use a computer and various sensors such as video to impart traffic-related information:
# self-steering from white line recognition;
# distance adjustment between cars from leading vehicle recognition;
# automatic braking systems from pedestrian recognition;
# notification of traffic signs; and so on.
In adverse weather conditions such as rain, snow, or fog, driving is more difficult than during fair weather. Weather changes temporally and spatially so it is important to develop real time sensor techniques that recognize weather in cars for driver assistance. A collision avoidance manoeuvre or Debris Avoidance Manoeuvre (DAM) is a manoeuvre conducted by a spacecraft to avoid colliding with another object in orbit. One is most commonly used in order to avoid a piece of space junk.
An airborne collision avoidance system (ACAS) is an aircraft system that operates independently of ground-based equipment and air traffic control in warning pilots of the presence of other aircraft that may present a threat of collision. If the risk of collision is imminent, the system indicates a manoeuvre that will reduce the risk of collision. ACAS standards and recommended practices are mainly defined in annex 10, volume IV, of the Convention on International Civil Aviation.
A collision avoidance system is a system of sensors that is placed within a car to warn its driver of any dangers that may lie ahead on the road. Some of the dangers that these sensors can pick up on include how close the car is to other cars surrounding it, how much its speed needs to be reduced while going around a curve, and how close the car is to going off the road.
Propulsion system
A propulsion system is a machine or system of machines that produces thrust to push or pull a vehicle from a position of relative rest into motion or to provide an acceleration or deceleration for a vehicle already in motion. The objective of a propulsion system is to maintain the vehicle’s ability to propel itself and maneuver.
Current propulsion systems are often some form of internal-combustion engine combined with aerodynamic lifting mechanisms.
On the ground and in the air the Waterman Aerobile is powered by a Studebaker engine. It can fly at 112 mph (180 km/h) and drive at 56 mph (90 km/h).
Rocket engines are available for hovering a vehicle for brief periods.

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