The transport minister will today officially open the Luton to Dunstable guided busway - five months after it was originally due to be completed.
Norman Baker will also mark the start of work on the Luton Town Centre Transport Scheme, which will complete the town's inner ring road.
The £90m busway was due to open in April but construction was delayed by bad weather over the winter.
Earlier this month, drivers were given training to operate a fleet of special buses which can run on the six-mile, bus-only track as well as on normal roads.
In August, BAM Nuttall, which is responsible for building the Luton-Dunstable busway, agreed to pay Cambridgeshire County Council £33m following a long-running legal dispute about the cost of its guided busway.