Public protection equipment such as bollards and barriers have been inserted in tourist hotspots including Chiado, Rua Augusta in the Baixa, and the Jerónimos Monastery.
However, the national level of alert regarding a potential terrorist attack has not been raised.
Lisbon town hall made the decision to bolster safety in the capital after 15 people died and hundreds of others were injured when a van ploughed into crowds of tourists along the busy Las Ramblas Street, which is one of Barcelona’s most popular attractions.
This was followed by another attack in Cambrils, Spain, in which one person was killed.
In a statement issued on Sunday, the town hall explained: “Lisbon Council is reinforcing the installation of passive safety measures on public streets, aiming to improve the protection in areas with a high influx of people.”
The statement said it involves solutions carried out in coordination with the PSP police that are compatible with quick access to possible rescue operations, in particular by firefighters and ambulances.”
The PSP said the measures involve “placing large and heavy objects that impede the passage of vehicles in these areas.”
Meanwhile, Albufeira, Portimão and Coimbra have revealed that they have had security measures in place for some time on public ways in their cities.
Barriers have been in place in Albufeira and Portimão for a number of years which stops cars from entering areas with large gatherings of people, especially during the crowded summer months.