There's good news and bad news for bus riders this week.

The good news is that Greyhound and Trailways have just instituted season fares that allow a rider to "go anywhere in the United States" within 30 days for only $55 dollars, one-way.

The bad news is that on Friday all other intercity passenger fares may be increased by 10 per cent.

Both major lines also announced a $39 fare for certain long distance routes that usually cost up to $55. That fare also allows an unlimited number of stopovers within a 30-day period.

Such reduced fares have become traditional during seasonally slack periods in bus transportation. Last year, the major lines offered a one-way ticket to any domestic city for $50 during the first five months of the year, but it did not permit unlimited stopovers within a 30-day period.

Savings on certain trips will be considerable under the bargain rates. The savings over the normal fare from New York to Los Angeles, for example, is $109.10.

The Interstate Commerce Commission will consider on Friday a petition from the National Motor Bus Traffic Association, which was filed in November, that requests a 10 per cent across-the-board rate increase for all intercity passenger fares except commuter traffic.

The NMBTA request was made on behalf of most nationwide intercity bus carriers, including Greyhound and Trailways.

The White House Office of Price Stabilizations and the Department of Justice Anti Trust division have filed petitions against the increase in addition to a score of individual consumer protests.