Two lanes are blocked and and there's queueing traffic on the M1 northbound near Luton because of an accident between junction 10 for the A1081 Airport Way and junction 11A for the A5 Dunstable Northern Bypass.
Highways England say there are delays of 10 minutes for traffic travelling from Luton towards Milton Keynes.
Normal traffic conditions are expected between 3pm and 3.15pm.
The M1 motorway will be closed for two nights as Highways England urgently investigate what they describe as a potential concern.
Routine maintenance highlighted the issues with the gantries over the motorway and the work has been planned at short notice as a safety precaution.
The section affected stretches from junction 13 at Milton Keynes to junction 11 at Luton. The work will take place between 10 pm and 5 am with the southbound route affected on October 12 and the northbound route on October 13. Diversions will be in place during the closures.
During the work older, out-of-use speed cameras will be inspected and removed from overhead gantries.
There is very slow traffic on the M1 in Bedfordshire after a crash involving a car and a lorry.
One lane is closed northbound at Junction 12 for Flitwick A5120 / B5120 and there is congestion to Junction 11 A505 Dunstable Road / B579 Dunstable Road.
It is not if anyone has been hurt in the incident.
In reality it took the closure of a busy motorway and more than 17 hours to knock down a bridge but the Highways Agency has release footage of the whole operation speeded up to just over a minute.
The old Luton Road bridge across the M1 was demolished overnight on Saturday 10 September.
It's part of the £162 million project to build a dual-carriageway north of Dunstable linking the A5 and the M1.
Another bridge will be knocked down on Saturday 24 September and the M1 will be closed between junctions 11 and 12 between 8pm on Saturday and 2pm on Sunday.
Overnight bridge work requiring motorway closures will be carried out at junction 15 of the M1 near Northampton from Monday 23 June to Monday 4 August.
The work will centre on painting the Grange Park Bridge. Only one carriageway of the motorway will be closed at one time with traffic diverted up and over the junction.
Traffic police have released a shocking picture of a cyclist putting his life at risk in heavy rain on the M1 in Hertfordshire. Officers from the Bedfordshire, Cambridgeshire and Hertfordshire road unit took the picture yesterday and posted it on Twitter with the hashtag don't be a dummy.
The cyclist was wearing dark clothing and had no lights. He told police he was on his way to London. They escorted him off the motorway.
Plans to allow vehicles to use the hard shoulder on a section of the M1 in Hertfordshire have been judged a success by drivers.
The Highways Agency is operating the scheme between junctions 10 and 13 during the morning and evening commutes. Senior managers say that by allowing traffic to use the hard shoulders they've been able to reduce congestion and keep vehicles moving.
Drivers using the M1 between junctions 11 and 13 are being warned that the Highways Agency will be testing the newly-installed managed motorway systems from tonight, Tuesday 18 December, including use of the hard shoulder as a traffic lane.
At busy times the overhead electronic signals above the motorway will display variable mandatory speed limits within red rings.
To indicate when drivers can use the hard shoulder as an extra lane overhead message signs will be set by staff at the Highways Agency’s East Regional Control Centre.
One lane blocked due to accident on M1 Southbound between J13 A421 / A507 Salford Road / Bedford Road (Bedford / Milton Keynes South) and J12 A5120 (Flitwick).