The Blue Book Building & Construction Network® Announces Launch of New Industry Velocity Index News provided by Share this article Summary: The Blue Book Network ® has introduced a new construction index to track the direction and velocity of bidding activity in the commercial construction industry's largest and most active network. The Blue Book Network Velocity Index provides manufacturers, distributors, general contractors and subcontractors with a critical leading indicator of construction spending to inform key business decisions. Manufacturing and Industrial categories showed largest downturn at -24.1% and -9.6% respectively; Commercial reported modest increase of 5.1% to 83.6; Lodging, buoyed by New York, rose to 42.3 after low of 38.0 in October.