Two states, Indiana and North Carolina, restrict PPP projects solely to solicited projects, while Nevada allows only unsolicited projects. The remaining states have either no express provision on allowing for unsolicited projects or explicitly provide for both solicited and unsolicited projects. Allowing for unsolicited projects can create a more effective transportation network, as the private sector is often more innovative than the public sector in coming up with ideas for PPP projects. At the same time, however, states must ensure that they are reviewing only feasible unsolicited projects. States can require application fees or deposits in order to ensure this. Allowing for both solicited and unsolicited projects still provides a way for the public sector to ask the private sector to present proposals for needed infrastructure improvements.