Mr Keys gave oral evidence that the haul road was constructed of compacted gravel. He said that the shoulder was made of excess gravel and mud and sloped away from the road as can be seen from the photographs to which I have referred, such that there was a drainage channel on either side of the haul road.
Mr Keys also said that there was a significant difference between the appearance of the haul road and the shoulder in both texture and colouration during daylight, however at night, 'it looks as one'. He was aware that the shoulder was 'too soft' to drive on and that because of the recent rain, the shoulder may have been 'more softer' than usual. He therefore would neither attempt to drive, nor park, on the shoulder. His concern was 'getting bogged'.
Mr Keys did not have any problem in seeing the marker posts at night. On high beam, they could be seen from a distance of between 100 and 150 metres and on low beam they could be seen from approximately 50 metres. He also indicated, that, when passing an oncoming road train, he would aim to pass as close to the marker posts as he possibly could 'without running them down'. The reason for this was to leave the oncoming vehicle with as much room to pass as possible.
Mr Keys indicated that the BGC trucks were able to drive at a speed limit of up to 90 kilometres per hour, whilst the Jamieson Transport trucks were able to travel up to a speed of 70 kilometres per hour.
Importantly, Mr Keys was aware, that, the third trailer on haulage units may sway from side to side, especially on dirt roads. If that sway were to eventuate, then, in normal conditions, he would accelerate so as to cause the third trailer to come back into line with the rest of the unit. Braking might cause the trailer to slide and/or roll over. He knew that the third trailer is commonly referred to as the 'dog' trailer, because, like a dog's tail, it would 'wag'. Indeed, it is common ground that this sway, or the potential for this sway, is well known to the drivers of road trains.
In cross-examination however, Mr Keys indicated that he knew he should not drive off the edge of the road. He did not however, necessarily believe that he should not drive along the edge of the road. To the best of his knowledge, the edge of the road was delineated by guide posts. He also said that he should leave room between his truck and those delineators.
Driving on the shoulder was something Mr Keys said he would never do and he would not drive in such a manner that the third trailer might go onto the shoulder.
Further, in cross-examination, Mr Keys gave evidence that if the third or dog trailer were to go into the shoulder, then, it could become bogged and then it would be at risk of overturning. That could possibly also cause the second trailer to overturn. It could also be the case, that, the driver could lose control of the third trailer and then, as Mr Keys put it, 'I don't know what could happen'. He also conceded that if the trailer were to venture into the shoulder, and 'start to sink' then, it is possible that that could also cause sway.
Mr Keys then went on to say that there [are] a number of ways in which a trailer can sway into the shoulder, including:
(a) the driver positioning the prime mover, and hence the trailers, too close to the edge of the road;
(b) the driver performing a moving manoeuvre;
(c) a combination of speed and direction of movement; and
(d) other reasons, such as mechanical failure, movement of the product being transported in the trailers and road conditions [27] - [35].