plain how he came to drive the truck; nor could he provide rental documents for the truck under his control or any bill of lading for its contents. While these observations might not alone have constituted probable cause to search, they surely tended to establish facts and circumstances which would reasonably have warranted “the officers conducting the search ... to believe that they will find the instrumentality of a crime or evidence pertaining to a crime before they begin their warrantless search.” Dyke v. Taylor Implement Mfg. Co., 391 U.S. 216, 221, 88 S.Ct. 1472, 1475, 20 L.Ed.2d 538 (1968). Beyond independent evidence tending to establish probable cause, on-the-scene corroboration of key elements of an informer’s tip serves as an additional safeguard against fabrication. “The idea of ‘corroboration’ would seem in the end to be one key to sound resolution of motions to suppress.” United States v. Tucker, 248 F.Supp. 911, 915 (S.D.N.Y.1965), aff’d, 380 F.2d 206, 211 (2d Cir. 1967); see United States v. Colon, 419 F.2d 120, 121 (2d Cir. 1969) (per curiam). Prior to the search of the first truck, the agents were able to corroborate certain critical details of the informer’s story, including the identity of the trucks and their locations. Judge Weinstein thus did not err in refusing to require disclosure of the informer’s identity or in refusing to examine the informer in camera.
Inzerillo further argues that, even with probable cause, the warrant-less search of the first truck after it had been removed from the highway and returned to the service station was improper and that the fruits of the search should have been suppressed. Inzerillo claims that under Coolidge v. New Hampshire, 403 U.S. 443, 91 S.Ct. 2022, 29 L.Ed.2d 564 (1971), there has to be a “constitutionally significant” reason for not obtaining a warrant, and there was none here. The Court in Coolidge phrased the inquiry somewhat differently. At 403 U.S. 463 n. 20, 91 S.Ct. 2022, it emphasized that in considering the warrantless search of a vehicle stopped initially on the highway and subsequently searched in a different location, the basic question is whether the “initial intrusion” by agents of the Government, here the seizure, was justified by “exigent circumstances” applicable to moving vehicles.
Turning then to the justification for the initial seizure of the truck without warrant, a distinction is invariably made between seizures and searches
of a store, dwelling house, or other structure in respect, of which a proper official warrant readily may be obtained and [those] . . „ - of a ship, motor boat, wagon, or automobile . . ., where it is not practicable to secure a warrant, because the vehicle can be quickly moved out of the locality or jurisdiction in which the warrant must be sought.
Carroll v. United States, 267 U.S. 132, 153, 45 S.Ct. 280, 285, 69 L.Ed. 543 (1925). Although the Carroll Court did-note that “where the securing of a warrant is reasonably practicable, it must be used”, id. at 156, 45 S.Ct. at 286, decisions which followed have generally found indicia of impracticability and have upheld warrantless searches or seizures on probable cause where vehicles in motion or about to move are stopped on the road to permit searches for contraband. See, e. g., Husty v. United States, 282 U.S. 694 (1931); Brinegar v. United States, 338 U.S. 160, 69 S.Ct. 1302, 93 L.Ed. 1879 (1949); cf. Chambers v. Maroney, 399 U.S. 42, 90 S.Ct. 1975, 26 L.Ed.2d 419 (1969). When Agent Moore and two city detectives stopped the first truck, with Inzerillo at the wheel, on Atlantic Avenue in Brooklyn, the warrantless seizure was justified, as a warrantless search would then have been justified had the officers chosen to execute one. Although Inzerillo was thereafter detained and in custody, the officers may not have known whether his confederates were still at large and able to remove the truck or whether they had already been apprehended by other agents