AI cannot drive over many of Tanoa's beautiful bridges, and this issue has been present for 9 months since Tanoa released.
Info to help fix/debug it.
This bridge works fine from Left-to-Right and Right-to-Left
https://steamuserimages-a.akamaihd.net/ugc/809929504766704856/4821D8D4BE9FBAAC4E46564FAC1A17C42BD1CC97/
This bridge works only from Left-to-Right, is broken Right-to-Left
https://steamuserimages-a.akamaihd.net/ugc/809929504766705468/29F2716D60BEAE3526E7D82DC9C9BCE9515B09B0/
This bridge is broken from Left-to-Right, but works Right-to-Left
https://steamuserimages-a.akamaihd.net/ugc/809929504766706055/B98DCDE129B2283166A80EEC5B1A14C8CA95F713/