▁and ▁the ▁immediate ▁Bonn ▁area . ▁ ▁The ▁fre ew ay ▁was ▁opened ▁in ▁several ▁stages . ▁The ▁first ▁stage ▁was ▁a ▁ 2 ▁km ▁stretch ▁from ▁the ▁A   5 9 ▁to ▁the ▁j unction ▁Sieg burg ▁( then ▁named ▁Sank t ▁August in - Z ent rum ), ▁which ▁was ▁opened ▁in ▁ 1 9 7 4 . ▁The ▁next ▁portion , ▁from ▁Sieg burg ▁to ▁ 5 0 0 ▁m ▁before ▁Nieder ple is , ▁opened ▁seven ▁years ▁later . ▁Att ention ▁then ▁turned ▁to ▁the ▁eastern ▁end . ▁The ▁section ▁from ▁Hen ne f ▁( S ieg )- West ▁to ▁the ▁end ▁of ▁the ▁fre ew ay ▁opened ▁in ▁ 1 9 8 6 , ▁leaving ▁a ▁gap ▁of ▁about ▁ 3 ▁km ▁between ▁the ▁two ▁sections . ▁The ▁ 5 0 0 ▁m ▁that ▁was ▁left ▁before ▁Nieder ple is , ▁plus ▁the ▁j unction ▁itself , ▁opened ▁in ▁ 1 9 8 8 ; ▁a ▁further ▁ 1 ▁km ▁and ▁an ▁inter change ▁with ▁the ▁A   3 ▁opened ▁in ▁ 1 9 9 0 ; ▁and ▁the ▁final ▁ 2 ▁km ▁were ▁completed ▁in ▁ 1 9 9 2 . ▁ ▁After ▁continu ing ▁n ortheast ▁past ▁the ▁j unction ▁Hen ne f ▁( S ieg )- West , ▁the ▁A   5 6 0 ▁suddenly ▁takes ▁a ▁ 9 0 - deg ree ▁turn ▁and ▁begins ▁heading ▁to ▁the ▁sout heast . ▁This ▁was ▁to ▁be ▁the ▁location ▁of ▁an ▁intersection ▁with ▁a ▁planned ▁aut