A mainline and on-ramp feed a shared bottleneck. A downstream off-ramp separates part of the discharged stream. Animate ramp metering and merge priority while comparing arrival, service and queue conservation.
• 3D scene parts: Mainline approach; metered on-ramp; shared merge nose; diverging off-ramp; ramp meter. • Controls: Mainline arrival (500–2400 veh/h); Ramp arrival (100–1200 veh/h); Merge capacity (1200–3000 veh/h); Ramp metering ceiling (100–1200 veh/h); Mainline priority share (40–90 %); Downstream exit share (0–50 %). • Live readouts: Mainline queue (veh); Ramp queue (veh); Merge discharge (veh/h); Ramp service (veh/h); Off-ramp flow (veh/h); Conservation error (veh). • Guided experiments: Ramp restriction; Merge overload; Adequate capacity. • Four tabs (visual laboratory, curves and measurements, experiments, learn and assess), a model-verification run, a timestamped event log and a trial report.
serviceA+serviceB≤capacity serviceB≤meter; Qnext=Q+(arrival−service)Δt Unused reserved capacity can serve the other queue exit flow=exit fraction × total discharge
Deterministic fluid merge with a work-conserving priority allocation and ramp ceiling. No lane-changing trajectories, accepted gaps, spillback, merge turbulence or downstream congestion. Screen cars represent aggregate streams, not individual agents. Try the preset experiments, then compare the live readouts with the equations.
No. It holds demand in a ramp queue.
No. Their allocated services share one ceiling.
Deterministic fluid merge with a work-conserving priority allocation and ramp ceiling. No lane-changing trajectories, accepted gaps, spillback, merge turbulence or downstream congestion. Screen cars represent aggregate streams, not individual agents.