* Stuff left to do

** DONE Detect when player leaves the road
** DONE Add non-player cars onto the road
*** DONE Add constant van on one lane
*** DONE Put van on random lane
*** DONE Add multiple vehicles on different lanes
*** DONE Ensure vehicles don't overlap
** DONE Detect collision with other vehicles
** DONE Make cars in different lanes drive at different speeds
** DONE Add restart option
** DONE Smooth acceleration
** TODO Measure traveled distance
** TODO Smooth increasing turn rate
** STARTED Display level on screen
** TODO Add weapon to player car
*** TODO Make weapon a power-up
*** TODO Make weapon use limited (bullet? time?)
** TODO Add graphical speedometer (look at knight rider)
** TODO Improve visuals
** TODO Add start menu
** DONE Add music
** STARTED Add sound effects