There is a tunnel for US-1 under the New River.If memory serves me correctly, there is a road tunnel for U.S. 1 and Las Olas close by. Of course, the tunnel is the most expensive option. The original bridge was double tracked at one point, so that would be the least expensive. A 3% to 4% grade even for Brightline is not ideal, I think. Thank you for bringing me up to date on this.