The entire length of Florence Place, outside Downs Infants School
Grantham Road outside Downs Junior School, from the junction with Ditchling Road to the junction with Edburton Avenue
Somerhill Road outside Brunswick Primary School, south of the junction with Somerhill Avenue
The council said it is trialling "physical measures, to determine which model works best in the long term".
Residents living in or close to these roads have been sent a letter about the measures, which are being installed on a trial basis through Experimental Traffic Regulation Orders.
The restrictions will not apply to:
• residents who live on the street