TRN-00 · laboratory
Greenshields, stopping sight distance, AASHTO equivalent axle and rail cant.
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26 governing sheets
Linear v = vf (1 − k/kj); q has a parabolic maximum.
Traffic flowSSD = v tr + v² /(2 a) with v in m/s.
Geometric designLoad equivalency ≈ (L/80 kN)^4 for flexible pavements.
Pavemente = G v² /(g R) for a balanced curve.
Rail geometryd = 0.5 C (1−λ)² /(1−λ x) for an undersaturated approach.
Signalsq = k v, the definition of traffic flow.
Traffic flowd = v² /(2 μ g) on a level road.
BrakingL = A S² / (200(√h1+√h2)²) when L > S.
Geometric designLEF = (P / 80)^4. One 80 kN axle is one ESAL on a flexible pavement.
PavementPSD ≈ v tp + v²/(2 a) + d3. Perception, acceleration past the oncoming, and clearance.
Geometric designh = G v² / (g R). Equilibrium cant; deficiency is h_eq − h_actual.
RailPCR = 100 − wr ur − wc uc − wi IRI. A linear distress deduction from 100.
Pavementw = (q2 − q1) / (k2 − k1). Rankine–Hugoniot on the fundamental diagram.
Trafficd = 0.9 [C(1−λ)²/(2(1−λx)) + x²/(2q(1−x))]. Uniform plus random delay.
Signalsc = c0 N fw fHV fp. HCM multilane snapshot, c0 ≈ 2200 pc/h/ln.
TrafficR = v² / (g (e + f)). Side friction plus superelevation balance the lateral acceleration.
Geometric designA² = R Ls, θs = Ls /(2R). Curvature grows linearly from 0 to 1/R.
Geometric designy = A x² / (200 L), A = |g2 − g1| in percent. Midpoint offset E = A L / 800.
Geometric designq = k v. The definition of flow on a homogeneous stream.
Traffickj = 1000 / sj. sj is bumper-to-bumper spacing in metres, kj in veh/km.
Trafficq = vf k (1 − k/kc) for k ≤ kc, else q = vw (kj − k). A piecewise q–k.
TrafficN = (V t̄) / T. Spaces occupied = arrivals in period T times mean duration.
Parkingt = t0 (1 + α (V/C)^β). Bureau of Public Roads; α = 0.15, β = 4 classic.
Trafficqpce = qcar + ET qtruck + ER qRV. Heavy vehicles counted as ET cars.
Trafficq = k v, v = vf (1 − k/kj). A linear speed–density fundamental diagram.
TrafficSSD = v t + v² / (2 g (f±G)). Perception–reaction plus braking.
Traffic