An obstacle (also called a barrier, impediment, or stumbling block) is an object, thing, action or situation that causes an obstruction. Different types...

An obstacle course is a series of challenging physical obstacles an individual, team or animal must navigate, usually while being timed. Obstacle courses...

Obstacles to troop movement represent either natural, human habitat originated, constructed, concealed obstacles, or obstructive impediments to movement...

In the military science of fortification, wire obstacles are defensive obstacles made from barbed wire, barbed tape or concertina wire. They are designed...

Obstacle course racing (OCR) is a sport in which a competitor, traveling on foot, must overcome various physical challenges in the form of obstacles. Races...

The obstacle-free zone (OFZ) is a 3D volume of airspace below 150 feet (46 m), above the established airport elevation which protects for the transition...

anti-personnel obstacle breaching system (APOBS) is an explosive line charge system that allows safe breaching through complex antipersonnel obstacles, particularly...

Obstacle avoidance, in robotics, is a critical aspect of autonomous navigation and control systems. It is the capability of a robot or an autonomous system/machine...

Obstacle swimming is a sport in which competitors swim through a water course that includes obstacles that impede their path between the starting and...

Many types of obstacles are found in competitive horse jumping sports such as show jumping, hunter classes, and the cross-country phase of eventing. The...