Need to put some more money on your SmarTrip card? You might want to do it tomorrow — over the weekend, a number of SmarTrip functions won’t be available as WMATA conducts software upgrades.

Metro on Monday will being testing a new software program designed to provide a real-time back-up to the rail system’s crash-avoidance system, Lena Sun reports in the Post. The software was developed by WMATA and Annapolis-based developer ARINC following NTSC recommendations after the deadly June 22 Red Line crash. “With the software, a malfunction will trigger a visual and audio alarm on controllers’ screens at Metro’s operations center; controllers will be required to acknowledge…