If you show them you can get it done by taking shortcuts, running or speeding, nothing will ever change. You are getting it done. That's all they know.
Yup. No one will look out for your safety and well-being except you. You have a responsibility to yourself when you go out there to focus on getting back safe, having not hit anything and having not had an accident. ANY DAY WITHOUT AN ACCIDENT IS A GOOD DAY. Also, make sure you always do a full and complete pre-trip, even if it takes longer and results in you leaving the building late. You are responsible for properly inspecting the vehicle before you leave. It seems like a majority of couriers barely do a pre-trip at all. If something appears wrong with the vehicle, speak up and say that you cannot take it.