0 s ▁saw ▁the ▁Trans - Can ada ▁Highway ▁system ▁being ▁upgrad ed ▁to ▁four - lane ▁express ways . ▁This ▁included ▁a ▁new ▁route ▁between ▁S ack ville ▁and ▁Am her st ▁running ▁roughly ▁parallel ▁to ▁La Plan che ▁Street ▁( N ova ▁Scot ia ▁Highway ▁ 1 0 4 - N ova ▁Scot ia ▁Tr unk ▁ 2 ▁meeting ▁New ▁Brun sw ick ▁Highway ▁ 2 ). ▁Services ▁in ev it ably ▁became ▁concentr ated ▁at ▁the ▁A ul ac ▁exit , ▁where ▁the ▁P E I ▁route ▁branches , ▁and ▁La Plan che ▁Street ' s ▁economy ▁began ▁to ▁fade . ▁Vari ous ▁brid ges ▁and ▁sections ▁of ▁La Plan che ▁Street ▁were ▁dis m ant led ▁and ▁the ▁street ▁was ▁divided ▁into ▁three ▁dis connected ▁segments . ▁The ▁S ack ville ▁segment ▁( B ridge ▁Street ) ▁remains ▁vital , ▁while ▁A ul ac ▁and ▁Am her st ' s ▁host ▁numerous ▁dil ap id ated ▁sh ops , ▁plants ▁and ▁mot els , ▁and ▁serve ▁the ▁fr inge ▁economy ▁and ▁culture ▁of ▁the ▁two ▁communities , ▁mask ing ▁the ▁centuries ▁of ▁history ▁for ▁which ▁it ▁was ▁stage . ▁ ▁Geography ▁ ▁Ch ig nect o ▁Ist hm us ▁ ▁La Plan che ▁Street ▁travers es ▁the ▁low - lying , ▁southern ▁edge ▁of ▁the ▁Ch ig nect o ▁Ist hm us , ▁which ▁connect s ▁Nova ▁Scot ia ▁with ▁New ▁Brun sw ick ▁and ▁thus ▁main land ▁Canada . ▁The ▁Ist hm us ▁runs ▁from ▁the ▁Pet it