Terry McGarvey


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Research results from Terry


Barrier separated road type design: accelerated degradation

To reduce the risk of vehicular head-on collisions, the Swedish Transport Administration (Trafikverket), has been transforming high traffic-volume conventional roads into barrier separated roads. This process has reduced the number of fatalities by...

Measurement of tyre width and assembly type (single or double tyre)

Data provided by VTI vehicle position surveys is only relevant to the right hand side of a vehicles front wheels. No tyre width or type information is available. As parameters such as wheel paths (centre point of a single or double tyre) are...

Vehicle lateral position depending on road type and lane width: vehicle position surveys...

In previous studies of barrier separated road types, it was found that vehicle lane position and the amount of lateral wander varied depending on road type and lane width. These variations will have a direct effect on the rate of surface wear and...

Influence of heavy traffic lateral wander on pavement deterioration

Lateral wander of the traffic has an impact on the degradation development of pavements. This is usually not accounted for in the structural design process. Facilities with wide carriageways and broad shoulders tends to have relatively large lateral...