Stunt research

So I decided to look online and play some games to get a better feel for racing mechanics and I found out a lot that I want to try out. In almost all video games there are always obstacles that the player must past and some of them that I would like to introduce are

Tight Corners:
        This situation always forces the player to smash into the corner of the track/ Decelerate or brake really hard or some players learn how to drift which I find is a hard mechanic to master in games
                     examples: burn out franchise / need for speed

Natural Causes:
           So in some games the actual course attacks or slows a player down either by a set trigger or another player activates the trap. In racing games this is an added bonus because people in first place now have to worry about more then just staying in first but gives them the ability to screw some people over :D
                                    Mario Kart
Dirt:
    Self explanatory anything other then the race course will slow down the player except for designated shortcuts
                           Mario Kart, all racing games really

Other AI:
    Simply other cars on the track the player must avoid  in order to stay in the lead or face crashing into them  and losing their place int he race.

Obstacles in General:
      Cones- Cones in general forces players to choose a side or hit them slowing them down a bit?
      Oil Barrels- Barrels other players can hit and spill oil on the track that will slow down or hydro plane other players :D
      Exploding barrels- Barrels that explode after a set time after being hit by a player or random barrels that explode while setting up other players?
      Oil on fire- After a barrel explodes oil can ignite which players must avoid or crash?


http://www.youtube.com/watch?v=D7iNbyLOWSg
 The above video shows a cars drifting in a crazy way which got me to think maybe add drifting for some short cuts so players can take a chance and drift a shortcut or slow down for choosing a bad short cut.

http://www.youtube.com/watch?v=_0QZTKWjNDo
 Some cars go up walls or ride a canyon side to side. ( maybe add some cool level design that allows cars to finish the race in a crazy way?


http://www.youtube.com/watch?v=wiZoVAZGgsw
 A car that thinks it a roller coaster :p

http://www.youtube.com/watch?v=1SPd9wTPV4g
   just a cool trick car rides on two wheels maybe we can do it just for fun by going over certain areas? Death race example

http://www.youtube.com/user/hotwheels?v=sWngzmFCpeM
 Hot wheels another Loop

http://www.youtube.com/watch?v=FH2XUFx1RG0
Dirt 3 a crazy stunt that a player did kind of cool.