When used on a flat surface, the bridge stands high enough for trains, boats and other vehicles to pass underneath it freely. The six wide integral bridge supports that stand under each bridge section offers great stability so that the bridge can handle even the most heavy-handed of traffic. Can be rebuilt to form two smaller bridges by adding two ascending tracks. Alternatively, you can try using a different connecting track, like a curved track, in the middle of the bridges to create new designs. Compatible with most other wooden railway systems. For ages 3 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.