Lockdown restrictions preventing people from leaving home unless it is essential have been introduced in Northern Ireland.
They can be ordered to return to their homes by police as part of measures agreed by Stormont ministers.
The health service is under severe pressure, with hospitals at full capacity and cancer surgery among operations cancelled in Belfast.
The total Covid-19 related deaths figure has now reached 1,895, the Northern Ireland Statistics and Research Agency (Nisra) said.
The weekday traffic volume has already fallen by around 58%.
Tighter rules around movement will remain in place until February 6 but will be reviewed later this month.
They have forced most mainstream schools to remain closed after Christmas.
A-level and GCSE exams are cancelled and gatherings for religious worship have been halted.
Stormont ministers are set to meet on Friday, with a row about a planned school transfer test set to be discussed.
Post-primary transfer tests – used by many grammar schools to select pupils – were due to be held soon, with the first scheduled for Saturday.
Those found to have breached the rules can be issued with a £200 fixed penalty notice or a fine of up to £5,000 if the case goes to court.
Indoor and outdoor gatherings have been reduced from 15 people to six from only two households.
Stormont Justice Minister Naomi Long said: “It’s often second nature to nip out in the car but we must all stop and ask ourselves if that journey is essential.
“Where possible, we must all stay at home.
“Staying home means you will not fall foul of the law.
“Staying home means you will protect your loved ones; and staying home means you will save lives.”