ODOT variable speed limit program reducing accidents on treacherous stretch of I-90 But setting up variable speed limits in other hazardous traffic areas is not as easy as it sounds.

Health programs that use social and related data obtained through surveys or other methods need to distinguish among so-called independent variables. Three groups of independent variables are (a) ...

The variable speed limits in ITDs pilot project would alternate the speed limit from its current 55 mph threshold down to 45 mph during peak traffic times.