Adverse weather conditions - especially in Manchester, UK. Rain and droughts in one day are not unknown or unexpected.
Navigation - getting lost isn’t always as adventurous as it may appear.
Time and day light - lost in your thoughts? You may find time flying more rapidly than usual. Pay attention.
Driving tiredness and wildlife encounters - deer, snakes and wild boar.
Falling objects - frogs and bricks, etc.
Sun exposure - sunscreen and a visor included on essentials kit.
Access restrictions
Traffic
Emergency
Hyperthermia - bobble hat and gloves at the ready at all times.
Bus wars - people are extremely defensive of their community bus routes. If using public transport, be sure to be respectful. No feet on seats.
Angry people - see above.
Dog attacks (don’t stroke unknown dogs, however appealing).
Diversions - try not to get unexpectedly distracted by shiny things.