E telē atu lona aui o le laupapa nai lo le laupapa laupapa laupapa ae e faigofie atu le fausaga o le laulau. O vaega uma o loʻo faʻapipiʻiina ina ia mafai ona faʻaogaina le alalaupapa e avea o se alalaupapa tumau ona o lona laʻititi laʻititi. O vaega e fesuiaʻi ma faʻaaogaina faʻalua.
D-Type Big Span Steel Bridge ua faʻaaogaina lautele i le laveaʻiina ma faʻalavelave faʻalavelave, faʻainisinia fefaʻatauaʻiga, inisinia faʻasao vai a le malo, faʻamalosia alalaupapa mataʻutia, ma isi faʻaopoopoga i le avea ma alalaupapa uʻamea ua saunia i taua.
1. Faiga faigofie
2.malosi fetuutuunai
3. lelei interchangeability
4. umi umi
5.sefe tau
6.fa'aoga lautele