Long tailbacks and queues of up to 15 minutes have been reported throughout Northampton this morning.
Delays have been reported on Welford Road and Kettering Road heading through Boughton, the A43 near Moulton and across the A45 Lumbertubs Way and Mere Way. Further delays have been reported on the Northampton Road near Collingtree.
No crashes or collisions have been reported.
A weather warning was issued last night that plunging temperatures of around -10C could cause black ice as the weekend's snow froze.
Gritters have been operating throughout the night.