In recent years there has been a significant increase in the number of personal mobility vehicles (PMVs) of all kinds, used in urban scenarios. In this context, autonomous cars will encounter numerous problems due to their perception limitations and sometimes, unpredictable behaviours of PMV users. Therefore, it is particularly important to study the interaction between autonomous cars and those vehicles. Among PMVs, e-scooters have become increasingly popular. Despite this, very little attention has been given to studying their behaviour in shared spaces. This work aims to develop a behavioural model for e-scooters that can be integrated into the existing autonomous vehicles simulator SPACiSS.