So far so good. In the last 40 hours there have been no — that means zero — fatalities along the 5,600 miles of highway that make up Interstates 90 and 94 from Washington to New York State.

Police all along the route, including the State Patrol in Minnesota, are out in force this weekend looking for speeders, drunken or distracted drivers and people not wearing seat belts as part of the I-90/94 Challenge. Their goal is to record no traffic deaths and to cut in half the number of crashes on what has been the most dangerous period of the summer on the two freeways over the past three years.

From 2011 to 2013, more than 524 crashes have been recorded during the Aug. 1-4 time frame, and three resulted in deaths.

But this weekend they are hoping for zero.

Here’s the weekend tally so far: As of 4 p.m., there have been no fatalities. In Indiana a State Police trooper suffered minor injuries Saturday morning at the hands of an alleged impaired driver. In South Dakota, two impaired drivers were arrested as thousands of motorcyclists make their way to Sturgis for the annual bike rally. Wisconsin’s State Patrol reported 352 traffic stops and one person arrested for impaired driving. In Ohio there were two serious-injury crashes that closed the turnpike for a while. In Michigan, patrol officers made two drug arrests and a stolen vehicle recovery arrest.

And in Minnesota a state trooper stopped two motorcycles traveling 108 mph on I-94 near Barnesville.