42 persons have been arrested by Police opposite the Presidential Secretariat having arrived in four vehicle processions.
Police said 16 women and 26 men are among the group that was arrested.
Police Media Spokesman Senior DIG Ajith Rohana said two Police teams were deployed to advice the group to refrain from protesting, taking into consideration the coronavirus situation in the country.
The Senior DIG said the group however disregarded advice and continuously protested, adding that more Police teams were deployed and the individuals were subsequently arrested.
He added ten vehicles that were part of the procession have also been seized.
Statements are being recorded from the 42 persons who will subsequently be produced before Court.
Legal action will be taken against the group under the National Highways Act on charges of obstruction, being part of an illegal gathering and obstructing traffic along a main road including the Quarantine and Prevention of Diseases Ordinance.
Heavy traffic congestion was reported earlier owing to the vehicle protest by teacher and principal trade unions.
NewsRadio correspondent said the protest was launched seeking solutions to salary anomalies.
The vehicle procession was launched from Kadawatha, Kottawa, Moratuwa and Welisara and reached the Presidential Secretariat.