oun io , ▁via ▁V ou li ag men i . ▁It ▁was ▁first ▁constructed ▁in ▁the ▁ 1 9 5 0 s ▁as ▁a ▁one ▁l ane ▁per ▁direction ▁road , ▁but ▁the ▁section ▁between ▁Ath ens ▁and ▁V ark iza ▁was ▁later ▁extended ▁to ▁two ▁lan es ▁per ▁direction . ▁It ▁has ▁many ▁extremely ▁dangerous ▁curves , ▁and ▁acc idents ▁happen ▁frequently . ▁Currently , ▁there ▁are ▁no ▁plans ▁to ▁replace ▁it ▁with ▁a ▁by pass ▁or ▁re construct ▁certain ▁dangerous ▁parts , ▁but ▁there ▁has ▁been ▁an ▁effort ▁to ▁increase ▁police ▁presence ▁to ▁prevent ▁illegal ▁racing ▁and ▁viol ation ▁of ▁speed ▁limits ▁which ▁were ▁common ▁phen omena ▁over ▁the ▁last ▁ 1 0 ▁years . ▁The ▁highway ▁becomes ▁bus ier ▁during ▁the ▁summer , ▁as ▁most ▁of ▁the ▁places ▁it ▁connect s ▁are ▁popular ▁vac ation ▁sp ots . ▁ ▁Route ▁The ▁Greek ▁National ▁Road ▁ 9 1 ▁begins ▁in ▁the ▁centre ▁of ▁Ath ens , ▁and ▁runs ▁south west ▁to ▁the ▁S aron ic ▁G ulf ▁coast ▁at ▁Pala io ▁F ali ro . ▁This ▁section ▁is ▁named ▁Andrea ▁Syn gr ou ▁Avenue . ▁From ▁Pala io ▁F ali ro ▁it ▁continues ▁sout heast ▁along ▁the ▁coast , ▁passing ▁along ▁the ▁southern ▁and ▁sout he astern ▁sub ur bs ▁of ▁Ath ens . ▁The ▁section ▁between ▁Pala io ▁F ali ro ▁and ▁G ly f ada ▁is ▁named ▁P ose id on os ▁Avenue . ▁ ▁The ▁Greek ▁National ▁Road ▁ 9 1 ▁passes ▁through ▁the ▁following ▁places :