Traffic Impact Assessment - Examples & Applications

An intersection carries $1,250\text{ veh/h}$ in the current PM peak. A development opens in four years. If a screening study assumes $2.0\%$ annual compound background growth, estimate the opening-year no-build volume.

A proposed development is estimated to generate $420$ PM-peak-hour driveway trips. A justified pass-by fraction of $25\%$ applies to the land use. Determine the screening estimate of primary/diverted trips that add demand to the broader network, while also identifying the driveway effect of pass-by trips.

The $315\text{ trips/h}$ from the previous example are distributed $55\%$ north, $30\%$ south, and $15\%$ east. Determine the assigned peak-hour demand by approach.

A signalized approach has a no-build average control delay of $43\text{ s/veh}$ and a build-condition delay of $67\text{ s/veh}$. The 95th-percentile queue also increases beyond the available turn-lane storage. Explain why the mitigation review must consider more than the LOS letter.