If the signage at the bus station entrance is unchanged from that in the Bing street side imagery (no entry except local buses), the access tags should probably be:

vehicle=no + bus=designated + emergency=yes

It shouldn't have motor_vehicle=yes or bicycle=yes tags, as both are explicitly forbidden by that sign.

https://www.bing.com/maps?toWww=1&redig=0E61462A315B4089ADF0DBB49CFAA9E5&cp=51.062492%7E-0.333052&lvl=19.5&mo=om.1&pi=1.2&style=x&dir=30.2