Updated: Based on testimony from the Thruway Authority acting executive director, the total cost of their 140 signs along the system was $2.7 million, bringing the total cost to $8.1 million.

The purchase and installation of signs along state highways advertising tourism in New York cost $5.4 million — nearly five times the amount initially estimated, according to state Transportation Commissioner Matt Driscoll.

The signs have become the subject of an ongoing dispute between officials in New York state government and federal officials in Washington.

The federal government contends the signage, advertising the I Love NY brand, apps and other amenities, is actually illegal, given they do not direct motorists to specific location or provide guidance on travel conditions.

All told, the cost to manufacture the 374 signs was $3.1 million. Installing them cost $2.3 million, Driscoll said. There are 514 signs along state highways and the Thruway system.

Initial cost estimates pegged the signs at $1.7 million, according to Gannett in Albany, which first broke the news about the ongoing dispute over the signage.