Dear Dr. Gridlock:

The District of Columbia will be issuing $100 tickets to any ride-share driver stopping on 14th Street near the Washington Monument to pick up riders so they can use the express lanes of I-395. Unless the District offers an alternate pick-up spot, commuters from Virginia will not be able to form car pools. Is there anything you can do to resolve this problem?

Could you please explain to the District that if commuters are forced to drive into the District, there will be increased traffic problems due to more cars coming into the city? Could you please explain to the District that cars stopping at the current pick-up spot do not block Constitution Avenue and that the District's fear of this is misplaced?

The ride-share system has been working smoothly for many years. It benefits all concerned, including the District of Columbia. Your efforts to keep the system working will be much appreciated. CHARNEY WEBER Alexandria

D.C. police Officer Walt Ferguson said, "The police department recognizes the benefit of car pools, but we have to enforce the no stopping/no standing restrictions."

The police do not issue $100 tickets for violating these restrictions; the penalty is $35.

The Department of Public Works also is trying to coordinate with the ride-share program to find other areas where drivers can pick up passengers without blocking traffic. One possible location they are considering is on 10th Street NW, between Pennsylvania and Constitution avenues. Another, which they are discussing with the Park Service, is the 1400 block of Madison Drive. George Schoene, the city's chief traffic engineer, said that using one location would not rule out using the other. He said that he would welcome reader response to both ideas. Write to Schoene c/o the D.C. Department of Public Works, 2000 14th St. NW, Washington, D.C. 20009. Please send a copy to Dr. Gridlock. Who Needs the Lights at the Zoo? Dear Dr. Gridlock:

Traffic on Connecticut Avenue could be sped up, a little, if we do away with two unnecessary lights at the zoo.

That is, they are not needed when the zoo is closed . . . which is much of the time. ALEX FRASER Washington

George Schoene, the city's chief traffic engineer, said the lights are not solely for the zoo. One of those lights, on Connecticut Avenue at the zoo's pedestrian entrance, is for pedestrians trying to cross to the west side of Connecticut Avenue where there are a number of stores and apartment buildings.

The other signal is for the driveway entrance to the Kennedy-Warren apartment building.

"Connecticut Avenue is a high-density area. A lot of people would be very unhappy if we took the lights away," Schoene said. 'Clara Barton Parkway' Bill Introduced

UPDATE: Rep. Constance A. Morella (R-Md.) of Montgomery County has introduced legislation in the House to change the name of the George Washington Memorial Parkway on the Maryland side of the river. The new name would be "Clara Barton Parkway."

Morella took the step in response to reader complaints about the confusion engendered by having two George Washington Memorial Parkways running parallel on opposite sides of the Potomac River.

The next step for the bill is the House Interior and Insular Affairs Committee, which apparently will take up the matter after returning from summer recess after Labor Day. Good for the Morella! We'll keep you posted. Charging Rush-Hour Fares on a Holiday Dear Dr. Gridlock:

Here's another Metro story that demands clarification. On July 3, a holiday for many in this area, my wife and I took the Red Line from Friendship Heights to Smithsonian around 11:30 a.m. for the normal, nonrush-hour fare of 80 cents. According to your paper, nonrush-hour fares were in effect all day on July 3, yet when we returned around 5 p.m. we were charged the rush-hour fare of $1.30 {each}. I pointed this out to the attendant at Friendship Heights, only to be told that the machines at his station were programmed for nonrush-hour fares and that the problem therefore was at the Smithsonian station. So if this is correct, we were overcharged {a total of} $1 by Metro. But just think what Metro must have taken in that day with thousands upon thousands leaving the Folklife Festival and the Mall area between 3:30 and 6 p.m. on a holiday and paying rush-hour fares. Perhaps {Metro} can tell us all how much the system took in by this sleight-of-hand maneuver. ROBERT M. BRADSHAW Chevy Chase

Metro spokeswoman Marilyn Dicus said this week that Metro has not received any other complaints of overcharging on July 3. Nonrush-hour fares were indeed in effect all day on July 3, Dicus said, so you should have been charged only 80 cents each. But unless you still have the Farecards from that day, there is no way to tell what the problem was.

For future reference, Dicus outlined the steps you should take if you believe you have been overcharged.

First, ask the Metro station attendant to check your Farecard on the verifier to determine what happened. The verifier reads the magnetic stripe on the Farecard and lets the attendant know where and when you entered and left the Metro system. If you were overcharged, the station attendant will help you fill out a refund form or get a new farecard.

If for some reason you don't want to deal with the station attendant, you can send the Farecard directly to Metro headquarters with a letter explaining the problem. The address is: Treasurer's Office, Metro Headquarters, 600 Fifth St. NW, Washington, D.C. 20001.

You also can take the Farecard to Metro's Sales and Redemption Center, which is inside the Metro Center station at the 12th and F streets entrance. The clerks there will be happy to help you, Dicus said.

Dr. Gridlock appears in this section each Friday to explore what makes it difficult to get around on roads. We'll try to find out why bad situations exist and what is being done about them. You can suggest problems by writing to GRIDLOCK, c/o The Washington Post, 1150 15th St. NW, Washington, D.C. 20071. Please include your full name, address and day and evening phone numbers.