The US state of Iowa is planning to invest $2.3bn over the next five years to increase the traffic capacity of the state’s highway system.

The Iowa Department of Transportation (IDoT) said about $1.2bn will be spent on rehabilitating existing highways and on safety and maintenance measures in the state.

Funding includes $105m for interstate maintenance, $81m for non-interstate pavement repairs, $35m for non-interstate bridge improvements and $15m for safety projects.

The highway section also involves interstate modernisation investments of $570m on various parts of I-29 and $31m for I-74.