Restaurants are worried about how a stricter proposed drinking-and-driving law could affect their bottom line. The National Transportation Safety Board (NTSB) wants to make it illegal to drive with a blood-alcohol content level above 0.05, which for some people could mean a single glass of wine or beer. Businesses are concerned that the potential new law would deter diners from drinking at all- and spending less- or discourage people from going out in the first place. For restaurants, booze can make up as much as 40% of revenue, so it’s no surprise the food and hospitality industry isn’t on board with the new guidelines. While the NTSB hopes to decrease alcohol-related traffic fatalities by changing the law, critics say lowering the legal limit won’t make a difference.