crossing barrier

crossing barrier

[′krȯs·iŋ ‚bar·ē·ər]
(genetics)
Any of the genetically controlled mechanisms that either prevent or significantly reduce the ability of individuals in a population to hybridize with individuals of other populations.
References in periodicals archive ?
A DRIVER who drove under a level crossing barrier as it was closing has been labelled "reckless" and "extremely dangerous".
This is not a blanket indictment of either the crossing barrier design or the parallel barrier design without the increased helix angle.
Witnesses said the bus went through a closed crossing barrier, and passengers said they screamed "Stop, stop
The force of the crash with the crossing barrier and the train destroyed the pensioner's white car.
Police said the level crossing barrier was down and red warning lights flashing when the woman, in her 20s, started to cross.
The teenager was killed after hurdling a level crossing barrier following a pursuit in Enfield, north London.
The rush-hour smash occurred in the Ottawa suburb of Fallowfield after the bus burst through a closed railway crossing barrier.
Included in the current design of the intersection is a new roundabout, traffic islands on all approaches, a layby on the southern approach to the roundabout for heavy vehicles waiting to turn right into Ferry Road, rail crossing barrier arms, new footpaths and cycle facilities, and a dedicated left-hand turn lane to Ferry Road.
A MOTORIST who drove under a level crossing barrier as it was closing has been labelled "reckless" and "extremely dangerous".
Witnesses said the bus ploughed through a lowered crossing barrier and directly into the side of the passing, four-car train.
A third person in the car was killed after he climbed over a level crossing barrier on to the train track and was hit by a northbound train.
A TEENAGER who took his grandfather's car and tried to kill himself by crashing through a level crossing barrier as a train approached has escaped being jailed.