import type { BrakingDistanceInput, BrakingDistanceResult } from './types.js';
/**
 * Braking Distance Calculator (AASHTO method)
 *
 * Calculates stopping distance based on:
 * - Reaction distance: d_r = v × t_reaction
 * - Braking distance: d_b = v² / (2 × g × (f ± G))
 *   where G = grade/100 (positive uphill, negative downhill)
 *
 * Reference: AASHTO "A Policy on Geometric Design of Highways and Streets"
 *
 * @throws {RangeError} Speed must be positive
 * @throws {RangeError} Friction coefficient must be positive
 * @throws {RangeError} Reaction time must be non-negative
 * @throws {RangeError} Effective friction (friction + grade) must be positive — vehicle cannot stop on this grade
 * @param input - speed, friction, reaction time, grade
 * @returns stopping distance components
 */
export declare function brakingDistance(input: BrakingDistanceInput): BrakingDistanceResult;
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