Hazard near Cambridge North Station
A friend recently smashed her shoulder by cycling into the car trap which awaits anyone who misses the "Except guided buses" sign and then misses the "Car trap" sign, while heading from North Station towards Milton Rd.
In the dark, this is actually an easy mistake for an inexperienced rider, since
a) you believe that you're on a road when actually you're on a piece of Guided Busway
b) these signs can appear to belong to the cycle path, where they are mounted.