Assuming that the military regulations try to emulate the CAA (CAP 168, derived from ICAO Annex 14, Volume I), the origin of the approach surface (1:50 slope) should be 60 metres before the threshold, and for a precision instument runway (ILS) be 150 metres either side of the runway centreline. Given that the road represents an obstacle 4.8 metres high, the road should be 240 metres from the start of the approach surface (and 300 from the threshold). So in practice the threshold should be displaced by 300 metres to provide the required clearance over the road.
Same applies to the take-off climb surface, except that it is only 90 metres either side of the centreline. To provide the clearance, a reduction of declared distances (of 300 metres)would be required. In any event the road would be repesented on the Type A chart as a 4.8m obstacle and taken into account during take-off performance planning.
The fence is also an obstacle.
Rail lines are considered a slightly taller obstacle to cater for any overhead power lines.
Mister B
Last edited by HTB; 7th Jul 2014 at 12:38.