| Clear zones must be traversable, allowing vehicles to recover or come to a safe stop. |
| The researchers found that the flies first visually measure the gap width and then only cross the gap if it is a traversable width. |
| Two other two-hinged frames form the west tower which is connected in a longitudinally traversable manner with the middle tower. |
| The American types had fully traversable turrets and extremely light armour and were built for speed. |
| Higher buildings like church towers only have two traversable levels and much of the land is devoid of any low brush vegetation. |
| All windows are optionally available with or without a traversable protective grill. |
