Why did the metro bus stop at each railway crossing, despite no warning indicating a train was coming?

I’m travelling in LA and we went to Knott’s Berry Farm for a day out. We took the metro 460 bus, which goes to DisneyLand. During the drive on the way there and back, I noticed a peculiar habit. The bus driver would come to a complete stop at railway crossings and then after a few seconds continue on. Other cars didn’t seem to do this and the driver did this on crossings with warning lights that would indicate a train was coming, but the lights weren’t on.

Why were the bus drivers doing this? I can understand slowing down, to prevent damage and such, but a complete stop seemed odd.

Creatine Philippines Micronized Creatine [ Sporting Goods ] Metro Manila, Philippines

Creatine Philippines At present, there are many products available in market which boasts of muscle gain feature. Selecting the apt product without any side effect is very important to get the best result. For selecting the right product, you need a little research first. Always make sure that you select the best product devoid of side effects. Berry, enriched with anti-oxidants is safe natural cure to build muscle fast…

Creatine Philippines Micronized Creatine [ Sporting Goods ] Metro Manila, Philippines