Tens of thousands of people are expected to attend this year's Brickyard 400 Race weekend. On Main street, restaurants are experiencing an increase in foot traffic."Foot traffic in the area never hurt anybody," said Brian Theising, shop lead at Speedway City Garage. "The weather is nice, so the garage door is open."The newly opened cafe has ordered additional supplies for race weekend. The Indianapolis Motor Speedway says more than 70,000 fans a…