FOUR cars have been involved in a collision on a busy Glasgow motorway.

The secondary carriageway of the M8 eastbound at junction 23 to junction 22 is blocked on the outside lane due to the smash.

Transport Scotland has advised drivers to expect delays as traffic is slow around the incident.

It is understood the crash occurred shortly after 8.45am.

The Trunk Road Incident Support Service is on its way, however, it is not yet known when the lane will fully re-open.

There are no reported injuries.

UPDATE: The incident has been cleared