Determination Of Headway And Average Travel Speed Of Vehicles
[Case study of post office-Kwara State Polytechnic permanent Site Car park Road]

Regulatory signs
Regulatory or mandatory signs are meant to inform the road users of certain laws, regulations and prohibitions; the violation of these signs is legal offence The regulatory signs are classified under the following sub-heads:-
(i)    Stop and Give-way signs
(ii)    Prohibitory signs
(iii)    No Parking and No Stopping signs
(iv)    Speed Limit and Vehicle Control signs
(v)    Restriction Ends sign
(vi)    Compulsory Direction Control and other signs
The stop sign is intended to stop the vehicles on a roadway; it is octagonal in shape and red in colour with a white border. This sign may be use in combination with a rectangular definition plate with the word ‘STOP ‘written in English and other languages as necessary.  The give way sign is used to control the vehicles on a road so as to assign right of way to traffic on other roadways This sign is triangular in shape with the apex downwards and white in colour with a red border, this sign may also be used in combination with a definition plate.
Prohibitory signs are meant to prohibit certain traffic movements, use of horns or entry of certain vehicle class. These signs are circular in shape and white in colour with a red border. The common prohibitory signs are, Straight Prohibited, No Entry, One-way, Vehicles Prohibited in Both Directions, All Motor Vehicles Prohibited, Truck Prohibited, Bullock Cart and Hand Cart Prohibited, Bullock Cart Prohibited, Tonga Prohibited, Hand Cart Prohibited, Cycle Prohibited, Pedestrian Right/Left Turn Prohibited, U-Turn Prohibited, Overtaking Prohibited and Horn Prohibited.
No parking sign is meant to prohibit parking of vehicles at that place, the definition plate may indicate the parking restriction with respect to days, distance, etc. The No Parking sign is circular in shape with a blue back ground, red border and an oblique red bar an angle of 45 degrees No Stopping/Standing sign is meant to prohibit stopping of vehicles at that place, the scope of the prohibition may be indicated on a definition plate. The No Stopping/Standing sign is circular in shape with blue background, red border and two oblique red bars at 45 degrees and right stale to each other.
Speed Limit signs are meant to restrict the speed of all or certain classes of vehicles on a particular stretch of a road. These signs are circular in shape and have white back ground, red border and black numerals indicating the speed limit. The vehicle control sings are also similar to Speed Limit signs with black symbols instead of the numerals. The common controls are. Width limit, Height Limit, Length Limit, Load Limit and Axle Load Limit. The definition plate may be used in combination to give more details, symbolically or by words.
Restriction Ends sign indicates the point at which all prohibitions notified by prohibitory signs for moving vehicles case to apply. These signs are also circular with a white back ground and a broad diagonal black band at 45 degrees.
Compulsory Direction Control signs indicate by arrows, the appropriate directions in which the vehicles are obliged to proceed. These signs are circular in shape with a blue back ground and white direction arrows.