Doing that was such an obstacle to overcome. After that is a steep stairstep obstacle to climb. Hurdling is the act of running and jumping over an obstacle at speed. This causes a serious obstacle in organizations attempting to adopt telecommuting. The pilot continues to be responsible for obstacle and terrain clearance. A prototype car had the ability to jump over an obstacle. Meeuwenberg failed a new First Stage obstacle, the Slider Jump. The crew misinterpreted and disregarded terrain obstacle warnings. Gravity is the primary obstacle to flight. International sanctions remain a significant obstacle to their development. This allows fish to swim upstream without leaping over an obstacle. Critical theory maintains that ideology is the principal obstacle to human liberation. Shrewd diplomacy dealt with the second obstacle, local opposition. The first obstacle to its construction was political. Robinson was successful despite the obstacle of racism.