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Insights — Mobility

Movement always leaves
vibration and noise behind

Roads, railways and underground spaces connect cities, but they also burden their surroundings. Drawing the line by calculation — how far that burden can be reduced, and where costs start to rise sharply — is the core of mobility engineering.

Articles

Mobility Insights

Diffraction paths by noise barrier height and the diminishing insertion loss curve
Mobility

How Many Decibels Does One More Meter of Noise Barrier Buy?

The limits of attenuation according to diffraction theory. Instead of raising the barrier further, we compare the cost-effectiveness of absorptive surfaces, top-edge shapes and source measures.

FEATURE2026.01.226 min
Railway protection zone setback, adjacent excavation influence line and track displacement limits
Mobility

Development Next to Railways: Common Sticking Points in Protection Zone Safety Reviews

Excavation depth and setback alone don’t decide the outcome. Case studies on the analysis conditions and monitoring plans that managing authorities actually require.

BLOG2025.12.055 min
Vortex shedding on bridge girders and vortex-induced vibration and flutter response curves by wind speed
Mobility

Bridge Wind Loads: Structures Where Static Calculations Fall Short

Galloping, flutter and vortex-induced vibration in long-span bridges and lightweight roof structures. Criteria for identifying when wind tunnel testing is essential.

FEATURE2025.10.307 min
Smoke control airflow, smoke layer and evacuation routes to cross passages in an underground tunnel
Mobility

Smoke Control and Evacuation Underground: When Ventilation Becomes Life Safety

Where everyday ventilation plans and fire smoke control plans conflict in complexes linked to underground spaces — and how performance-based design resolves it.

FEATURE2025.09.188 min
Distance attenuation of blasting vibration and peak particle velocity differences by measurement location
Mobility

Blasting and Pile Driving Vibration Complaints: Measurement Location Changes the Result

Even at the same site, the verdict changes with the choice of measurement points. Designing measurements to verify actual impact — not just to satisfy regulatory limits.

BLOG2025.08.215 min
Sequential versus parallel schedules for traffic impact assessment and EIA
Mobility

Traffic Impact Assessment and EIA: What You Save by Preparing Them Together

The surveys the two assessments require overlap substantially. A case in which running the procedures in parallel cut duplicate surveys and schedule delays.

BLOG2025.07.095 min
Checklist table for setting 1st/2nd/3rd alert levels by monitoring item
CHECKLIST2025.09.04

[Checklist] Guide to Setting Excavation Monitoring Thresholds

A practical resource on the basis for Stage 1, 2 and 3 thresholds and response procedures when they are exceeded.

Hyperbolic reflections in a GPR section and unidentified utilities below the detection depth limit
BLOG2025.06.12

What GPR Surveys Found — and What They Missed

Understanding the resolution limits of geophysical surveys and how to combine them with borehole investigations.

Cumulative construction noise complaints by timing of pre-construction briefings
BLOG2025.05.15

Construction Noise Complaints: Why Advance Briefings Matter as Much as Mitigation

Field observations of how complaint numbers changed when prediction results were shared with residents first.

Excavation and noise: check before
you break ground, and cut costs.

Just tell us the site conditions and nearby facilities, and we’ll outline the reviews and monitoring plan you need.