In New Zealand, the prevalent approach to surfacing chip-sealed roads is to utilize the Transverse Variable Application Spray Bar (TVAS), which sprays a reduced bitumen within wheel path zones to mitigate flushing, while applying a higher rate outside these areas to minimize raveling. Visual inspection is currently used to locate wheel paths for calibrating the TVAS. This study aims to automate obtaining vehicle positioning data. Additionally, prior research on lateral positioning has predominantly focused on a highway context. This study seeks to address this gap by exploring the relationship of vehicle positioning in regard to the different curves in an urban environment. The lateral positioning of vehicles across nine horizontal curves in Christchurch was recorded using a low-cost IoT prototype. This study finds that the design intended positioning differs from the actual observed location of vehicles around curves on local roads. This research presents the results of the impact of curve radius, lane width, and deflection angle on the vehicles’ lateral positioning around a curve. It has been found that a larger curve radius results in a more consistent vehicle path, and concentrated lateral positioning. These findings provide valuable references for TVAS calibration on horizontal curves.