Whenever I play outrun in my cab the traffic disappears into the distance and then there isn't any more traffic. Also, the timer runs out before I can even complete the first section.
Sounds like the game is only getting a limited range of values because your gas pedal hasn't been calibrated and/or MAME hasn't been properly configured.
Go to Windows Control Panel -- Devices and Printers.
- Right click on the icon for your wheel/pedals -- Game Controller Settings -- Properties.
- Check if moving the wheel and pedals through the full range of physical motion moves the crosshair/slider through the full range of motion. Calibrate if necessary.
I assume you've already read through the stickied beginners thread
here and adjusted deadzone, saturation, etc.
Scott