If you trained well, and you are confident you can do it, by all means push thru!
Even newbie runners can cover the first 50K well. It’s really a question of how well you can cover the next 30K and the last 22K.
Heat is one of the major factor in this race. You should have prepared for that.
Hunger, Thirst and yes, speeding buses are just minor concerns.
Stay on the left side of the road though. It’s safer.
Nothing beats a confident runner who has trained well.
Perseverance comes in at the right time you’d need it.
It’s now a question of how much you wanted to get that medal and beat the cut-off time.
Blessings to all runners.