No cause for alarm despite all the fire trucks today on the site of the new Minnesota Multipurpose Stadium.

A downtown commuter checked in after seeing a phalanx of red fire equipment on the site of the $1 billion project.

Minnesota Sports Facilities Authority spokeswoman Jenn Hathaway said the visit from fire fighters was a routine check-in for the crews to get updated on the lawout of the ever-progressing site.

Even the casual observer would notice the significant changes on the site. A structure is rising from the pit and a massive crawler crane already has begun lifting pieces of steel into place for the roof.

The massive structure will be double the size of the Metrodome, which was torn down for replacement last winter. The new stadium is expected to open for the 2016 NFL season.

Construction crews track the hot spots, where fire is used, on the facility carefully. Permits are required and workers mark on a board when they start the fire and check out when it's extinguished so managers can see what's happening at a glance from the main office.

Fire crews were checking out the site Tuesday just to get a handle of the new layout of the project. Hathaway said it's part of the construction process.

The project is the largest ever in the city of Minneapolis.

The Vikings are playing at the University of Minnesota's TCF Bank Stadium until their new digs are ready.