Cite as: 529 U. S. 344 (2000)
Opinion of the Court
quate warning devices . . . on any project where Federal-aid funds participate in the installation of the devices are to include automatic gates with flashing light signals" if any of several conditions are present. Those conditions include (A) "[m]ultiple main line railroad tracks," (B) multiple tracks in the vicinity such that one train might "obscure the movement of another train approaching the crossing," (C) high speed trains combined with limited sight distances, (D) a "combination of high speeds and moderately high volumes of highway and railroad traffic," (E) the use of the crossing by "substantial numbers of schoolbuses or trucks carrying hazardous materials," or (F) when a "di-agnostic team recommends them." § 646.214(b)(3)(i). Subsection (b)(4) states that "[f]or crossings where the requirements of § 646.214(b)(3) are not applicable, the type of warning device to be installed, whether the determination is made by a State regulatory agency, State highway agency, and/or the railroad, is subject to the approval of FHWA." Thus, at crossings where any of the conditions listed in (b)(3) exist, adequate warning devices, if installed using federal funds, are automatic gates and flashing lights. And where the (b)(3) conditions are not present, the decision of what devices to install is subject to FHWA approval.
"(D) A combination of high speeds and moderately high volumes of highway and railroad traffic.
"(E) Either a high volume of vehicular traffic, high number of train movements, substantial numbers of schoolbuses or trucks carrying hazardous materials, unusually restricted sight distance, continuing accident occurrences, or any combination of these conditions.
"(F) A diagnostic team recommends them. "(ii) In individual cases where a diagnostic team justifies that gates are not appropriate, FHWA may find that the above requirements are not applicable.
"(4) For crossings where the requirements of § 646.214(b)(3) are not applicable, the type of warning device to be installed, whether the determination is made by a State regulatory agency, State highway agency, and/or the railroad, is subject to the approval of FHWA."
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