3.3.4 High Stress Seals (HSS1 and HSS2)
High stress seals (HSS1 and HSS2) are bituminous seal or reseal treatments which are used in applications with moderate traffic loadings or where traffic is braking, accelerating or turning. Light‑to‑medium‑modified PMBs are utilised to cope with these traffic stresses, and aid aggregate retention.
A HSS1 is a single/single seal with PMB.
A HSS2 is a double/double seal with PMB in both applications.