Sound Barrier imagwiritsidwa ntchito kwambiri ngati kuchepetsa phokoso la misewu, msewu, viaduct ndi zina zomwe zimamveka phokoso. Ndi mtundu wa zotchinga zomwe zili pambali pa mseu kapena njanji kuti muchepetse phokoso lagalimoto pagulu loyandikira.