Try like this
DECLARE @Vehicle TABLE (
VehicleNo NVARCHAR(50),Datetime1 Datetime,Datetime2 Datetime);
INSERT INTO @Vehicle (VehicleNo,Datetime1,Datetime2)
VALUES('0500000001','06:52','06:59')
INSERT INTO @Vehicle (VehicleNo,Datetime1,Datetime2)
VALUES('0500000001','07:00','07:27')
INSERT INTO @Vehicle (VehicleNo,Datetime1,Datetime2)
VALUES('0500000144','10:59','11:03')
SELECT top 1 * FROM @Vehicle WHERE VehicleNo=(SELECT MIN(VehicleNo) FROM @Vehicle)
UNION
SELECT top 1 * FROM @Vehicle WHERE VehicleNo=(SELECT MAX(VehicleNo) FROM @Vehicle)