Expert-level transportation engineering covering highway design, traffic flow, intersection design, pavement design, traffic impact studies, and public transit.
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Flow, speed, density: q = k times u, fundamental flow relationship. Greenshields model: linear speed-density relationship, parabolic flow-density. Capacity: maximum sustained flow rate, varies by facility type. Level of service: A through F rating of traffic operations quality. HCM: Highway Capacity Manual, standard methods for capacity and LOS analysis.
Horizontal alignment: tangents and circular curves, superelevation. Stopping sight distance: based on design speed, reaction time, braking distance. Vertical alignment: grades and crest and sag vertical curves. Cross section: travel lanes, shoulders, medians, clear zones, slopes. Design speed: governs all geometric design elements.
At-grade intersections: signalized, stop-controlled, yield-controlled. Signal timing: cycle length, phase splits, offsets for coordination. Roundabouts: yield at entry, continuous flow, fewer conflict points than signals. Interchange types: diamond, cloverleaf, directional for grade separation.
Flexible pavement: asphalt surface on granular base, AASHTO design method. Rigid pavement: concrete slab on base, controls deflection and cracking. ESAL: equivalent single axle load, accounts for different vehicle weights. Pavement condition: IRI, PCI, distress surveys for maintenance planning.
| Pitfall | Fix |
|---|---|
| Ignoring pedestrians in signal timing | Include pedestrian crossing time in phase lengths |
| Insufficient sight distance on curves | Check both stopping and passing sight distance |
| Underdesigned pavement for actual trucks | Use actual axle load data for ESAL calculations |
| Wrong LOS method for facility type | Use HCM method specific to facility type |
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Expert-level abstract algebra knowledge. Use when working with groups, rings, fields, modules, Galois theory, representation theory, or algebraic structures. Also use when the user mentions 'group', 'ring', 'field', 'homomorphism', 'isomorphism', 'normal subgroup', 'quotient group', 'Sylow theorem', 'Galois theory', 'polynomial ring', 'ideal', 'module', 'vector space', or 'representation theory'.
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Expert-level acoustics knowledge. Use when working with sound waves, acoustic propagation, resonance, standing waves, Doppler effect, room acoustics, ultrasound, noise control, musical acoustics, or architectural acoustics. Also use when the user mentions 'sound wave', 'decibel', 'frequency', 'resonance', 'standing wave', 'Doppler effect', 'acoustic impedance', 'reverberation', 'ultrasound', 'noise control', 'harmonics', or 'sound intensity'.
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Expert-level aerodynamics covering subsonic and supersonic flow, lift and drag, airfoil theory, boundary layers, compressible flow, and CFD methods.
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Expert-level air quality engineering covering pollutant sources, atmospheric dispersion, air quality standards, emission controls, and air quality modeling.
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Expert-level aircraft structures covering structural design philosophy, wing and fuselage analysis, fatigue and damage tolerance, composite structures, and certification.
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Expert-level algorithms and complexity theory covering sorting, searching, graph algorithms, dynamic programming, greedy algorithms, NP-completeness, and algorithm design paradigms.
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