panama canal is the gap between the north and south american road systems.
panama canal is the gap between the north and south american road systems.
gap between the north and south american road systems?
panama canal
the north and south american road networks are separated by the darién gap, the only interruption in the pan-american highway. eurasia and africa are connected by roads on the sinai peninsula. the european peninsula is connected to the scandinavian peninsula by the øresund bridge, and both have many connections to the mainland of eurasia, including the bridges over the bosphorus. antarctica has very few roads and no continent-bridging network, though there are a few ice roads between bases, such as the south pole traverse. bahrain is the only island country to be connected to a continental network by road (the king fahd causeway to saudi arabia). even well-connected road networks are controlled by many different legal jurisdictions, and laws such as which side of the road to drive on vary accordingly.
road
n stands for "national" roads while r is for "regional" roads.









































section::::existing road systems.:national systems.:slovak d, r system.









































d stands for "diaľnica" (motorways) while r is for "rýchlostná cesta" (expressways).









































section::::existing road systems.:national systems.:south african n, r, m system.









































n stands for national road, r stands for regional road and m stands for metropolitan road.









































section::::existing road systems.:national systems.:vietnamese ql, tl, hl system.









































the following abbreviations appear on guide signs and kilometer posts:









































bullet::::- ct : (expressway)









































bullet::::- ql : (national road)









































bullet::::- tl or đt : or (provincial road)









































bullet::::- hl : or (rural district road)
road designation or abbreviation