Hi graziani,
According to Jeppesen General - Introduction - Chart glossary under the term High speed taxiway / turnoff (HST) the maximum specified speed is 60 knots. In LIRF for runway 16L you have DE,DG and DH as HST. As it is a maximum speed it means that you can but you're not obliged to vacate at that speed and a lower speed is mostly welcome. Common sense applies.
Ciao.