I've tried both and prefer the Laredo Bridge #2 crossing to Columbia. Turn in the Vehicle permit on the right (you'll be almost under the bridge you will soon cross back into the US) There's a booth you ride up to to return the permit. After that backtrack back away from the bridge in the direction you just came from. A sharp dogleg right and the bridge is ahead. There are some abandoned booths that once were used to return the VIP - ride slowly through to the next booth where there's a toll collected for the bridge. https://www.cityoflaredo.com/bridge/bridgecameras/pages/bridge-ii-mex.html (link to a camera to see what kind of wait you can expect). I last crossed in February 2020 - no escorts needed or available either southbound or northbound. N. Laredo has a bad reputation but I've crossed there dozens of times - even in the wee hours without an issue.