Twenty-two extra security guards are now patrolling the Barcelona Metro network, bringing to 164 the total number of security personnel at work at any one time. The citys busiest line, L5, now has 29 guards and dog-handlers, double the number deployed in March. Reinforcements to the security service will continue throughout the year. The 1.2 million passengers who use the metro daily are also protected by 2,100 closed circuit video cameras, covering practically the entire metro network. Transports Metropolitans de Barcelona (TMB) expects the extra security measures to have a deterrent effect on crime as well as to improve response time in the event of accidents.