Full-time tram lanes often utilise raised curb dividers to physically prevent cars from straying onto tram tracks. Examples of these dividers can be seen on Spencer Street, Swanston Street in Carlton and Fitzroy Street in St Kilda. Vehicles must not enter a full-time tram lane at any time except to avoid an obstruction; even then, vehicles must not proceed by law into the lane to do so unless they will not delay any approaching tram/s from either direction. The limit for staying in the lane to avoid an obstruction is 50 metres, at which point a vehicle must exit the lane entirely. Some lanes only allow this to occur at certain points, or breaks, in the raised dividers. Crossing the raised dividers otherwise can cause severe damage to a vehicle.