How can you detect and report unlawful use (e.g. travelling by public transport outside office hours)?

Prevention is better than cure. Prevention in this case means explaining well in advance to employees what the ground rules are within the mobility scheme. Of course, we can provide support in this. Once employees travel, we always assume good faith; after all, we do not determine whether someone is travelling legitimately or not. And once the journey has been made, it should always be paid for. What we then do is provide insight and overview of trips that “deviate”, e.g. a weekend or evening train journey. When something deviates we determine in advance together when implementing the mobility scheme. As an employer, you can see from the reports which trips may have been unlawful, and you can have a discussion with the employee concerned.