Nicola Sturgeon has announced a travel ban will be introduced for millions of Scots as part of the fight against coronavirus.
People living in level 3 and 4 areas - the tiers with the most stringent restrictions - must not travel outside their own council area except for "certain essential purposes."
Sturgeon also said there must not be any "non-essential travel between Scotland and other parts of the UK."
Under the current five-tier system, restrictions on travelling between local authority areas amount to advice only.
For weeks, the First Minister has said her Government has been considering putting the guidance on a legal footing.
Such a move would be geared towards preventing people from high prevalence areas travelling to areas with lower levels of the virus.
Addressing MSPs today, she said: "I can confirm that the guidance that has been in place in recent weeks will become law from Friday.
"That means people living in level 3 or level 4 must not travel outside their own council area, except for certain essential purposes."
She added: "People living elsewhere in Scotland must not travel to level 3 or level 4 areas, except for essential purposes.
"And there must be no non-essential travel between Scotland and other parts of the UK."
She also said: "I know this is difficult, but it is essential. Broadly comparable restrictions have been or continue to be in force in England and Wales.
"And if we are to maintain a targeted approach and allow low prevalence areas to live with fewer restrictions, I cannot stress enough how important it is that we all abide by these rules."
