 Relatively high road speeds are possible because the highway now bypasses many of the towns where there were speed limits.Further, in 2013 the entire Hume Highway was completed as a dual carriageway, whereas the rail line is still single-track in some places – a crucial impediment to continuous running.Sections of the line in NSW are signalled for a top speed of due to curves with small radii (some are ) and steep gradients (some are 1